No Tor IP is banned.
You see, all Tor users counts as one, this is why there are no IDs at some posts on boards with IDs enabled. No flags either. Staff - neither board local, nor global - can't see IP hashes because of this. There is no ability to ban TOR IPs.
The TOR IP list is updated nightly.
BO's have the option to block Tor users all together on their boards, keep this in mind. If you can post with particular exit node on one board, but not on the other, then BO disabled Tor posting on his board.

My guess is: stop using VPN over Tor or Tor over VPN.