Link underline behavior issue in same version of IE

Hi Experts,

I am having a weird link underline behavior in same version of IE.
I am testing web based app and a underline in footer on a login page act differently between same version of IE.(one in intranet and another one is in my machine that is connected via VPN.)

From the below code, there is no underline for the first "Contact Us" link (IE 8) in company's work station. (the second "Contact" underline works fine everywhere.) However, everything is fine (also IE 8) in my laptop that is connected via VPN. I tried to manipulate css file, but wasn't successful.
I checked another co-worker's IE (within intranet) and it's also showing same issue.

I cleared cache in IE, but didn't help.

My question is why the "Contact Us" underline(the first one) is working in my laptop with same version of IE, but is not working in company's IE browser.

Any ideas?

<div id="foot">
			<a href="http://www.xxx.org/" rel="external" title="xxx"><img src="./images/xxx.png" alt="xxx" /></a> 
			<ul><li>
			  
			<a  href="mailto:xxx@xxx.org" title="Send an Email">Contact Us</a></li>
			    <li>xxx</li>
			    <li>xxx</li><li>xx, xx 7777</li> 
			    <li>xxx-xx-xxxx</li>
			 
			   
			  
			</ul>
			<a href="http://www.xxx.org/" rel="external" title="xxx"><img src="./images/xxx.png" width="200" height="18" alt="xxx" /></a> 
			 
			 
			
			<ul><li>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
			
			<a href="mailto:xxx@xxx.org" title="Send an Email">Contact Us</a></li>
			    <li> xxx</li>
			    <li>xxx Ave.</li><li>City, xx  88888</li> 
			    <li>xxx-xx-xxxx</li><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/><br/>
			    
			  
			</ul>
			 
			 
			
		</div>

/////////////////////////////////// css file /////////////////

/* *****************
FOOTER
***************** */

#foot {
	clear: both;
	height: 110px;
	background: url(./css_images/gradient05.png) 0 0;
	z-index: 50;
	overflow: hidden;		
}
#foot img {
	margin: 10px 10px -20px 20px;
}

#foot ul {
	position: relative;
	top: -2px;
	display: block;
	width: 760px;
	height: 10px;/* spacing between KKI address and OIF address*/
	margin-left: 190px;
	font-size: 12px
}

#foot ul  li {
	display: inline;
	margin: 4px;
}

#foot ul  li:first-child {
	margin-left: 0;
}

#foot a {
	color: black
} 

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