Have any of you forum owners run into that a username changes by itself, due to a bug?

The story behind this is that I have posted messages on a private forum with three moderators with my real name as username. Some time ago the name was changed to another and I can not longer log in. I guess it’s only moderators who can change a user name, but all three deny and say that there must be a bug in the program responible for this. I find it strange that only my name would be changed among all 500 users.

Is there a log of what has happened with my account? Would it be possible to see when and by whome the name change was done?

The version of the forum should be 1.2.12