Como arrumar esse CSS ? é o que eu acho

BOm galera, eu tenho um menu, 

ele é um menu daquele q quando você passar o mouse ele aparece, (desculpem eu esqueci o nome) '-' 

mais enfim, coloquei o link, porém o link esta aparecendo em outras paginas e quando tiro o link as paginas ficam normais, enfim, eu acho que é o css, tem como você's verem??

vou postar o codigo do CSS, e a pagina com o link

CSS:  

*{
margin: 0px;
padding: 0px;
}
body{
background-color: #FFF;
}

/*Configuração do topo */

header{
width: 100%;
height: 145px;
float: left;
background-color: #5ba452;
}

header #topo{
width: 1120px;
height: 155px;
margin: 0 auto;
}

#logo{
width: 231px;
height: 53px;
float: left;
margin-top: 10px;
}

#topo-right{
    width: 455px;
    height: 144px;
    float: right;
}


#topo-right p{
width: 455px;
margin-top: 25px;
margin-bottom: 20px;
font-family: Tahoma;
color: #FFF;
font-size: 14px;
text-align: right;
}

#topo-right p a{
    color:  #073e00;
    text-decoration: none;
}

#topo-right #busca-organica{
    width: 400px;
    height: 40px;
    border: none;
    background: #fff;
    float: right;
    box-shadow: inset 0px 0px 5px 1px #cfcdcd;
    font-family: Tahoma;
    font-size: 16px;
    color: #073e00;
    text-align: right;
    padding: 0px 10px 0px 10px;
}
     

/* Configurações do Menu */

#menu{
    width: 100%;
    height: 50px;
    float: left;
    background-color: #0e7501;
        
}

#menu nav{
    width: 1120px;
    height: 50px;
    margin: 0 auto;
}

nav ul#menu-screen{
    list-style: none;
    margin: 0;
    padding: 0;
}

nav ul#menu-screen li{
    width: auto;
    height: 90px;
    display: inline;
    padding: 15px 15px 16px 15px;
    text-align: center;
    float: left;
    margin-right: 7px;
    font-family: Tahoma;
    font-size: 16px;
    color: #FFF;
        
    }
    
    nav a{
        color: #0e7501;
        text-decoration: none;
        
          
    }
    
     ul#menu-screen li ul li:hover a{
        color: #FFF;
        text-decoration: none
    }
    
    ul#menu-screen li a:hover {
        color: #FFF;
        text-decoration: none
    }
    
    
    
    nav ul#menu-screen li:first-child{
        width: 130px;
        height: 19px;
    }
    nav ul#menu-screen li:hover{
        background-color: #fff;
        color: #0e7501;
        cursor: pointer;
    }
    nav ul#menu-screen li ul{
        display: none;
    }
    
    nav ul#menu-screen li:hover ul{
        display: block;
        ;
        margin-top: 16px;
        width: 1080px;
        height: auto;
        padding: 20px;
        float: left;
        background-color: #fff;
        box-shadow: 0px 3px 4px 1px #ccc;
        border-radius: 0px 0px 4px 4px;
        position: relative;
        z-index: 3;
        
           
    }
    
    nav ul#menu-screen li:hover ul li{
    width: auto;
    height: auto;
    color: #121212;
    display: block;
    padding: 0px;
    margin-right: 10px;
    padding: 5px;
    border-radius: 2px;
    
        
}

nav ul#menu-screen li:hover ul li:hover{
   background-color: #0e7501;
    color: #fff;
    
        
}

/* Configuração do Conteúdo */

main{
    width: 100%;
    height: auto;
    float: left;
    position: relative;
    z-index: 1;
    margin-bottom: 30px;
}

section#content{
    width: 1120px;
    height: auto;
    margin: 0 auto;
    }
    
    section#conteudo{
        width: 700px;
        height: auto;
        float: left;
    }
    
    section.banner{
        width: 690px;
        height: 270px;
        float: left;
        margin-top: 20px;
            
    }
    
    section.banner ul li a img{
        max-width: 690px;
        max-height: 270px;
        min-width: 690px;
        min-height: 270px;
    }
    
    section#artigos{
        width: 700px;
        height: auto;
        float: left;
        margin-top: 20px;
    }
    
    section#artigos article{
        width: 218px;
        height: 270px;
        float: left;
        font-family: Tahoma;
        color: #0e7501;
        margin-left: 12px;
        margin-bottom: 15px;
        
    }
    
    section#artigos article h1{
        width: 218px;
        height: auto;
        float: left;
        font-size: 18px;
        text-align: left;
        padding: 0;
        
    }
    
    section#artigos article h1 a{
        color: #000000;
        text-decoration: none
        
    }
    
    section#artigos article img{
        width: 210px;
        height: 160px;
        float: left;
        margin-top: 5px;
       
    }
    
    section#artigos article h2{
        width: 218px;
        height: 55px;
        float: left;
        font-size: 14px;
        text-align: center;
        padding: 0;
    }
    
    section#artigos article h2 a{
      color: #000000;
      text-decoration: none  
    }
    
    section#publicidade-conteudo{
        width: 700px;
        height: 90px;
        float: left;
        margin-top: 10px;
        background-color: #ccc
        
    }
    
    /* Configuração da Sidebar */
    
    section#sidebar{
        width: 400px;
        height: auto;
        margin-top: 20px;
        float: right;
       
    }
    
    section#publicidade-sidebar{
        width: 400px;
        height: 250px;
        float: right;
        background: #ddd;
        margin-bottom: 15px;
    }
    
    section#widget-ultimas-noticias, section#widget-categorias-portal{
        width: 400px;
        height: auto;
        float: right;
        font-family: Tahoma;
        font-size: 14px;
        
    }
    
    section#widget-categorias-portal{
        margin-top: 15px;
    }
    
    section#widget-ultimas-noticias h1, #widget-categorias-portal h1{
        font-size: 16px;
        background-color: #0e7501;
        color: #fff;
        padding: 7px 12px 7px 12px;
        width: 376px;
        height: auto;
        float: right;
        border-radius: 2px;
        position: relative;
        z-index: 2;
    }
    
    section#widget-ultimas-noticias ul, #widget-categorias-portal ul{
        list-style: none;
        margin: 0;
        padding: 0;
        height: auto;
        float: right;
        margin-top: 5px;
    }
    
    #widget-categorias-portal ul{
        display: inline
    }
    
    section#widget-ultimas-noticias ul li, #widget-categorias-portal ul li{
        color: #5ba452;
        width: 386px;
        height: auto;
        padding: 5px 7px 5px 7px;
        float: right;
        -webkit-transition: all 0.3s ease-in-out;
        -moz-transition: all 0.3s ease-in-out;
        -o-transition: all 0.3s ease-in-out
    }
    
    section#widget-ultimas-noticias ul li a, #widget-categorias-portal ul li a {
         color: #000000;
        text-decoration: none;
        
    }
    
    section#widget-ultimas-noticias ul li:hover a, #widget-categorias-portal ul li:hover a{
        color: #FFF;
        text-decoration: none;
    }
    
    #widget-categorias-portal ul li{
        width: auto;
        height: auto;
        padding: 7px 5px 7px 5px;
        float: right;
       
    }
    
    
    
    section#widget-ultimas-noticias ul li:hover, #widget-categorias-portal ul li:hover{
        background-color: #0e7501;
        color: #fff;
        cursor: pointer;
            
    }
    
    /* Configuração Noticias Interna */

section#banner-noticia{
	width: 690px;
	height: 270px;
	float: left;
	margin-top: 10px;
	overflow: hidden;
}

section#banner-noticia img{
	width: 690px;
	height: 270px;
}

section#info-noticias{
	margin-top: 20px;
	float: left;
	text-align: left;
}

section#info-noticias h1{
	width: 679px;
	height: auto;
	text-align: left;
	padding: 0;
	margin: 0;
	margin-bottom: 5px;
}

section#conteudo-noticia{
	width: 690px;
	height: auto;
	margin-top: 20px;
	float: left;
	text-align: justify;
}

section#tags{
	width: 670px;
	height: auto;
	float: left;
	background-color: #E2E2E2;
	color: #121212;
	padding: 10px;
	margin-top: 10px;
	text-align: left;
	border: 2px dashed #BBBBBB;
}

/*Configuração página de Categoria */

section#categoria-news, section#categoria-news-error{
	width: 650px;
	height: auto;
	float: left;
	margin-top: 20px;
	padding-bottom: 10px;
}

section#categoria-news h1, section#categoria-news-error h1{
	width: 100%;
	height: auto;
	text-align:left;
	font-size: 20px;
	font-family: Tahoma;
	padding: 10px 0px;
	border-bottom: 1px solid #BCBCBC;
	margin-bottom: 10px;
}

section#categoria-news-error h1{
	border: none;
	font-size: 24px;
}

section#categoria-news h1 a{
	color: #121212;
	text-decoration: none;
}

section#imagem-noticia{
	width: 160px;
	height: 160px;
	float: left;
	border: 5px solid #fff;
	box-shadow: 0px 0px 2px 1px #999999;
	margin-right: 20px;
	margin-bottom: 3px;
	margin-top: 8px;
	overflow: hidden;
}

section#imagem-noticia img{
	width: 160px;
	height: 100%;
	float: left;
}

section#categoria-news p{
	text-align: justify;
	font-size: 14px;
	font-family: Tahoma;
	color: #121212;
}

section#categoria-news p a{
	color: #1C4788;
	text-decoration: none;
}
    
    /* Configuração do Footer */
    
    footer{
        width: 100%;
        height: auto;
        float: left;
        margin-bottom: 20px;
        background: #5ba452
        
    }
    
    footer #center-ft{
        width: 1120px;
        height: auto;
        float: center;
        margin: 0 auto;
        border-top: 2px solid #75b66c
    }
    
    footer #logo2{
        float: left;
        margin-top: 20px;
    }
    
    footer #center-ft p{
        font-family: Tahoma;
        font-size: 14px;
        color: #fff;
        float: right;
        margin-top: 25px;
    }
  

agora da pagina do menu:

<?php require_once "configuration.php"; ?> 

<!DOCTYPE html>
<html lang="py-br">
    <head>
       <meta charset="utf-8" />
        <title>Esportes Geral</title>
        <link rel="stylesheet" type="text/css" href="css/categoria.css" media="screen" />
        <link rel="stylesheet" type="text/css" href="css/noticia.css" media="screen" />
        <link rel="stylesheet" type="text/css" href="css/default.css" media="screen" />
        <script src="js/jquery-2.1.4.js" type="text/javascript"></script>
        <script type="text/javascript" src="js/easySlider1.7.js"></script>
	<script type="text/javascript">
		$(document).ready(function(){	
			$("#slider").easySlider({
				auto: true, 
				continuous: true
			});
		});	
	</script>
	
<link href="css/screen.css" rel="stylesheet" type="text/css" media="screen" />
        
    </head>
        
    <body>    
    
        <header>
                     
            <div id="topo">
                
                <div id="logo">
                    <a href="index.php">
                    <img src="imagens/Logo.png"  alt="Esportes Geral Logo" />
                    </a>
                </div>

                     <div id="topo-right">
                    
                    <p>Olá, Seja Bem Vindo <a href="paineldecontrole/index.php">Faça login</a> ou <a href="cadastrar.php">Cadastre-se</a>. </p>
                    
                    <form action="busca.php" method="GET">
                        
                        <input type="text" name="busca-organica" id="busca-organica" />
                        
                        <p><embed quality="high" src="http://www.cryd.com.br/relogios-feitos-em-flash/swf/01-10/481.swf" type="application/x-shockwave-flash" width="300" height="20" wmode="transparent"></embed></p>
                    </form>
                </div>
            
                   
            </div>
            
            
        </header>
        
        <div id="menu">
            
            <nav>
                <ul id="menu-screen">
                    
                   <li>Categorias do site
                    <ul>
                        <?php
                           
                        $SQL = mysql_query("SELECT * FROM categoria");
                        
                        while($ln = mysql_fetch_assoc($SQL)){
                         
                            
                          ?>
                        <li><a href="categoria.php?id=<?php echo $ln["id_categoria"]; ?>"/><?php echo $ln["nome_categoria"]; ?></li>
                        <?php } ?>
                    </ul>
                        </li>
                    <li>Publicidade</li>
                    <li>Quem somos</li>
                    <li>Parceiros</li>
                    <li>atendimento</li>
                </ul>
            </nav>
            
        </div>

estou com o problema nesse link:

<li><a href="categoria.php?id=<?php echo $ln["id_categoria"]; ?>"/><?php echo $ln["nome_categoria"]; ?></li>