It seems to be a problem rendering your site in IE…. I too work on a Mac and always encounter this because of IE’s short-comings.
I think this is pretty much a CSS issue. You can see how your site’s renedered in different versions of IE here: https://ipinfo.info/netrenderer/index.php
Then play adjust your CSS accordingly (I tend to use Firebug with FireFox to first test it then apply it, then test on the site I posted above)… You can also just create an IE specific styleshit and use conditional statements or PHP to detect your browser, and apply a class to the body specific to IE.
IF using WP 3.0, you can try the following placing this in your functions.php:
// Detect Browser
add_filter('body_class','browser_body_class');
function browser_body_class($classes) {
global $is_lynx, $is_gecko, $is_IE, $is_opera, $is_NS4, $is_safari, $is_chrome, $is_iphone;
if($is_lynx) $classes[] = 'lynx';
elseif($is_gecko) $classes[] = 'gecko';
elseif($is_opera) $classes[] = 'opera';
elseif($is_NS4) $classes[] = 'ns4';
elseif($is_safari) $classes[] = 'safari';
elseif($is_chrome) $classes[] = 'chrome';
elseif($is_IE) $classes[] = 'ie';
else $classes[] = 'unknown';
if($is_iphone) $classes[] = 'iphone';
return $classes;
}
and add the following to your body tag (or wherever you need it)
<body <?php body_class(); ?>>
Hope this helps…