log-in error

I went to the Tom's home page, clicked on the forums and it showed me logged in as a different user (don't remember who). I went back and went in again and it was fine. A little confusing. I'll post again if the problem continues.
 
That could explain the problems I've been having, some W*nker has been posting using my name, the admins at THG don't seem to give a Sh*t!
 
The only reason I noticed at all is because I changed the color scheme for my login. I have a light blue instead of the default red. It was rather noticeable. But again, if I hadn't changed the colors, I wouldn't have realized and would probably have gone on posting like normal.