I'm thinking now maybe it's something to do with this person's userid (107752)? I haven't seen this happen to anyone else now that I've had a chance to look around.
Attached are screenshots of before and after I upload the modified showthread.php doing only the modifications you call for in your .txt file. Also, here is a link to that thread if you'd like to see for yourself.
http://www.battleforums.com/showthread.php?t=90789
I've manually added, updated, and verified all of my tables... any ideas?
I suppose if this doesn't happen on a large-scale, I could always merge his posts into a new useraccount and see if it happens again.