hmmmm... that is indeed concerning. i just spoke to one of the programmers and he will check into it today.
to give a bit of a rundown, this forum is one of the most popular out there. it is not native code to tantalus but simply added on top for the sake of convenience. because it's a very popular program used by many websites it is a juicy target for spammers. user registration happens through the forum even though this is largely behind the scenes. the commenting feature on the coin records should not be tied into the forum code but it might.
rest assured i have this at the top of my to-do list and expect a solution this week.