I'd also would like to know what happened here, the best conclusion i have is that some jerk who probably has no life hacked the forum, deleted my account and set himself as an administrator.
Unfortunately, when i've tried to reinstall my username, i lost the all data from the past month so all the posts were lost. Don't worry, nothing bad will happen to the site, measures were taken and in case this kid will delete the database or the forum or the site or whatever access he has, he'll get in big trouble. i hope he covered good his tracks, for his best.