stranger things have happened. Here's what you can try. Change the access settings for EVERYONE other than yourself to No Access.
That should temporarily stop ALL access to the forum.
One more question, is there a group listed on the Access Control page of your admin section? It would be just above "Blocked IPs". If there is, that's the group that used to belong to the forum owner. It should not have transferred, but this is the internet, where anything is possible.....
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