The links you've provided are .htaccess protected, so I cannot access them.
Are you sure you have no clear attribute in the CSS in any selector beside that of the last one, and are you certain all elements in there are floated?
You might also want to add an http-equivalent tag to force IE into using standards of IE version XX, just to ensure it'll display fine in all of them.
HTML Code:
<meta http-equiv="X-UA-Compatible" content="IE=8" />
But, if you could either get rid of the protection for a while or provide access information in order to check the site, I'd be glad to help you should the suggestions above not help.