If you go directly to the Account Panel and unsuspend yourself, the system looks, sees you have not logged onto the Forum (Account Panel/cPanel do not count) recently, and puts you in line to be suspended. A day or so later, your suspension gets to the front of the queue, and you are suspended.
Log into the Forum. (you already did that to post). Stay a bit. Then go to Account Panel and unsuspend yourself. That should do it.