Error/bug while browsing forums (http://pwn.curse.com/google...)

The computer I use sometimes to browse the website uses IE 8 (latest version). Often what will happen, when I try to go back to the previous forum or back to the previous page, I click the back button and nothing happens, I end up on the same page.

When I click the dropdown menu below the Back button, somehow in between the two pages, another page *inserted* itself.

Example:
I am in the Heroes & AI forum, before that I was at the Guild Wars Forum, however when I check the dropdown arrow under the Back button now there is an address in between those two:
Heroes & AI
http://pwn.curse.com/google19defaultsCA
Guild Wars Forum

If I click Back more than once I usually end up at the page I meant to go back to, so it's no big deal but it is somewhat annoying.

Thanks, I will pass this along.