Are you at a college campus using a shared computer? Someone might have something installed on the computer you were using. Have you ever had your gold stolen? Its also a possibility you have malware installed.

In any case as others have mentioned, it sounds like you were caught up in the ban wave that just happened, so there was something similar between you and the others. Either your actions or software running in the background.

Your ban is already over but you can probably still get the mark removed from your account if you get the right GM on the right morning after he's had his coffee. Those that deal with it are very busy right now, try again in a couple days.