Menu Issues

The menu looks fine in IE, Firefox, and Chrome.  I am running IE 10 and the it looks fine I have tried on PC's running IE 9 and it also looks fine.  But on some PC's in IE 9 the menu looks like the image I've imbedded on a test page.  I have no idea what is causing this but I am hoping that you could help.   http://dev.webermfg.ca/?page_id=12