Why is this different in IE and Firefox??

[d0cpaul]

For some reason my header is showing up differently in both Internet Explorer and Firefox... I want my header to be the same size as my forum... but some of the codes aren't stretching out the header in Firefox... any ideas? I included a thumbnail at the bottom too.

Here is my css

/* ***** Custom CSS for Header and Featured Articles ***** */

.OuterWrapper{
 min-width:984px;
 margin:0 auto;
 overflow:hidden;
 }
.topMain{
 background:#fff;
 min-width:984px;
 float:left;
 *padding-bottom:8px
 }
.topWrapper{
 min-width:984px;
 float:left;
 }
.topAdd{
 float:left;
 padding:5px 0 5px 5px;
 }
.googleSearch{
 float:right;
 padding:5px 28px 72px 0;
 }

.loanWrapper{
 min-width:984px;
 float:left;
 background:url(http://www.loansafe.org/blog/images/blueBg.jpg) repeat-x;
 height:92px;
 }

.logo{
 float:left;
 padding:16px 0 0 12px;
 }

.topColumns{
 min-width:556px;
 float:right;
 padding:20px 9px 0 0;
 }

.column{
 min-width:185px;
 float:left;
 }

.columnImg{float:left;}

.columnText {
        float:left;
        width:110px;
        padding:0 5px 0 10px;
        color:#fff;
        font-family:Verdana, Arial, Helvetica, sans-serif;
        font-size:11px;
        line-height:13px;
        }

.column a {
	color: #ffffff;
        font-family:Verdana, Arial, Helvetica, sans-serif;
        font-size:11px;
        line-height:13px;
	text-decoration: none;
	}

.column a:visited {
	color: #ffffff;
	text-decoration: none;
	}

.column a:hover {
	color: #ffffff;
	text-decoration: underline;
	}


.topNav{
 min-width:984px;
 float:left;
 }

.nav{
 min-width:984px;
 float:left;
 background:url(images/navBg.jpg) repeat-x;
 height:26px;
 }

#pagebar {

    background: #527db0;
    min-width: 980px;
    height:15px;
    color: #ffffff;
    font-size: 11px;
    font-family: Arial, san-serif;
    margin: 0px auto 10px;
    padding: 8px 10px 8px 10px;
    overflow: hidden;
    border-top: 1px solid #5B80FF;
    }

.pagebar-left {
    min-width: 450px;
    text-align: left;
    margin: 0px 0px 0px 0px;
    padding: 0px 0px 0px 0px;
    float: left;
    }

#footer {
        min-width: 960px;

I also attached thumbnails of both FF and IE.