It's not supposed to be possible to move a regular topic into a gallery forum, so we'll need to get that fixed.
To correct your moved topic, you'll need to do a SQL command. You need to know the first POST_ID of the topic in question and the FORUM_ID of the forum you want to move it into.
Once you know those, you can use the following SQL command to move it back into the proper forum.
update ubbt_TOPICS set FORUM_ID='newforumid' where POST_ID='postid'
You'll replace newforumid and postid with the actual values.
