My friend has a site and he made me admin wit him, and wenever I post in someones topic, my post goes to the top, n it looks like i started the topic. Whats wrong??

Did he install a mod/hack which does this?

If not, maybe you just posted and the thread split into 2 pages, resulting in your post at being posted at the top of the 2nd page.

Its because in his settings he has it set to newest first and not oldest first.