Blah... I just tried it in IE and you're right... I hate the way IE does some stuff...
The search form and the search results both have the same URL:
http://shoutbox.menthix.net/basicsearch.php. I think IE treats them as the same thing because of that. When you view the results, the cached form is overwritten, so you see the results again when you go Back.
* WDZ wonders if the IE developers didn't have dynamic content in mind... 
Edit: Fixed with a half-assed hack.
/ 
