"IF" that wasn't u... It may be some idiot trying to pose as you.. He was trying his best to make himself look bad, then plugged and got banned.
He used ur name in another server... ur banned with that name on that server, so thats why it says u are banned, you would prob have to be unbanned to get it off ur signature
BTW: he/you was really funny spamming how he/you was best player in w3