It seems that if you are the moderator of a private forum, that status line carries over into the other forums too (right above the username). I wouldn't want people getting the wrong idea that I'm a person to ask about smiting virulent threads in General Chit Chat or something.
"Why can't you? You're a moderator, aren't you?"
"But it SAYS SO!"
"WHY WON'T YOU BAN THAT JACKASS?!"