Yes, I can't think how that could actually happen from a forum functionality point of view, since I can't think how permissions could be set up to force that behaviour (I can't check down at a permissions level to see if I'm mistaken about that though).
I'd suggest, as mooted above, that you clear your cache (or at least cookies), or try private browsing in whichever is your preferred browser to see if that changes the behaviour at all, and we'll take it from there.
JD