I had this now several times, I was on OTB Match, had some ace_bots on it, the join password was something completely random, so nobody could guess that password. But however, some poeple make it again and again to break through the password barrier.
Then it says ACE_BOT_XX changed name to <that player name> and the people start to play and that bot disappears.
Since that caught my attention, it only happens when bots are actually on the server.
Is that a bug? Or is there a website that displays passwords for match servers?