Mærkelig mellemrum i Internet Explorer

CSS kode 

 .underlinemenu{
 font-weight: bold;
 width: 100%;
 }
 
 .underlinemenu ul{
 padding: 6px 0 7px 0;
 margin: 0;
 text-align: right; 
 }
 
 .underlinemenu ul li{
 display: inline;
 }
 
 .underlinemenu ul li a{
 color: #494949;
 padding: 6px 3px 4px 3px;
 margin-right: 20px;
 text-decoration: none;
 border-bottom: 3px solid gray;
 }
 
 .underlinemenu ul li a:hover, .underlinemenu ul li a.selected{
 border-bottom-color: black;
 }
 
 /* MENU */
 
 
 #nav {
     margin: 0;
     padding: 7px 6px 0;
     background: #7d7d7d url(../images/gradient.png) repeat-x 0 -100px;
     line-height: 100%;
 
     border-radius: 2em;
     -webkit-border-radius: 2em;
     -moz-border-radius: 2em;
 
     -webkit-box-shadow: 0 1px 3px rgba(0,0,0, .4);
     -moz-box-shadow: 0 1px 3px rgba(0,0,0, .4);
 }
 #nav li {
     margin: 0 5px;
     padding: 0 0 8px;
     float: left;
     position: relative;
     list-style: none;
 }
 
 
 /* main level link */
 #nav a {
     font-weight: bold;
     color: #e7e5e5;
     text-decoration: none;
     display: block;
     padding:  8px 20px;
     margin: 0;
 
     -webkit-border-radius: 9px;
     -moz-border-radius: 9px;
     
     text-shadow: 0 1px 1px rgba(0,0,0, .3);
 }
 #nav a:hover {
     background: #000;
     color: #fff;
 }
 
 /* main level link hover */
 #nav .current a, #nav li:hover > a {
     background: #666 url(../images/gradient.png) repeat-x 0 -40px;
     color: #444;
     /*border-top: solid 1px #f8f8f8; */
 
     -webkit-box-shadow: 0 1px 1px rgba(0,0,0, .2);
     -moz-box-shadow: 0 1px 1px rgba(0,0,0, .2);
     box-shadow: 0 1px 1px rgba(0,0,0, .2);
 
     text-shadow: 0 1px 0 rgba(255,255,255, 1);
 }
 
 /* sub levels link hover */
 #nav ul li:hover a, #nav li:hover li a {
     background: none;
     border: none;
     color: #666;
 
     -webkit-box-shadow: none;
     -moz-box-shadow: none;
 }
 #nav ul a:hover {
     background: #0078ff url(../images/gradient.png) repeat-x 0 -100px !important;
     color: #fff !important;
 
     -webkit-border-radius: 0;
     -moz-border-radius: 0;
 
     text-shadow: 0 1px 1px rgba(0,0,0, .1);
 }
 
 /* dropdown */
 #nav li:hover > ul {
     display: block;
 }
 
 /* level 2 list */
 #nav ul {
     display: none;
 
     margin: 0;
     padding: 0;
     width: 185px;
     position: absolute;
     top: 35px;
     left: 0;
     background: #ddd url(../images/gradient.png) repeat-x 0 0;
     border: solid 1px #b4b4b4;
 
     -webkit-border-radius: 9px;
     -moz-border-radius: 9px;
     border-radius: 9px;
 
     -webkit-box-shadow: 0 1px 3px rgba(0,0,0, .3);
     -moz-box-shadow: 0 1px 3px rgba(0,0,0, .3);
     box-shadow: 0 1px 3px rgba(0,0,0, .3);
 }
 #nav ul li {
     float: none;
     margin: 0;
     padding: 0;
 }
 
 #nav ul a {
     font-weight: normal;
     text-shadow: 0 1px 0 #fff;
 }
 
 /* level 3+ list */
 #nav ul ul {
     left: 181px;
     top: -3px;
 }
 
 /* rounded corners of first and last link */
 #nav ul li:first-child > a {
     -webkit-border-top-left-radius: 9px;
     -moz-border-radius-topleft: 9px;
 
     -webkit-border-top-right-radius: 9px;
     -moz-border-radius-topright: 9px;
 }
 #nav ul li:last-child > a {
     -webkit-border-bottom-left-radius: 9px;
     -moz-border-radius-bottomleft: 9px;
 
     -webkit-border-bottom-right-radius: 9px;
     -moz-border-radius-bottomright: 9px;
 }
 
 /* clearfix */
 #nav:after {
     content: ".";
     display: block;
     clear: both;
     visibility: hidden;
     line-height: 0;
     height: 0;
 }
 #nav {
     display: inline-block;
 } 
 html[xmlns] #nav {
     display: block;
 }
  
 * html #nav {
     height: 1%;
 }