ctpcsw on "Website not displaying correctly"

Hi all-
I've heard from several people now that our website doesn't look correct on their computers. They say it looks like a big site map instead of displaying as it should. Has this happend to anyone else? Is there anything I can do about it? It always looks great on my computer so I'm wondering if it might be a setting on someone's computer or an issue of their security level being too high? I really have no idea. Any help would be greatly appreciated.