When i relog all goes fine. Just quit the game and come back again, all fixed.
I didn't transfer, but this is probably true. I've had my account mistakenly flag as F2P a few times:
Once when they first launched it.
Once when CSR restored an item.
One other random time.
In all cases a relog or restart of the game fixed it. It's annoying though because your extra bars get reset and any extra bank tab items get sent to in the mail. I remember last time this happened to me it took 45 - 60 minutes to get my bars and banks all back in order. I wish they would nip this bug.