I know. It's a little strange. Trust me, I've heard all kinds of stuff going on, but essentially I've pointed iTunes to a new location to look for shows. So it'll do that once, but then you should be okay.
Believe it or not, I've seen it split the feed on one computer, so essentially iTunes subscribed to the MC TWICE! I mean, I appreciated the computer's support of the show and all, but yeah...split the feed. So again, for any weirdness happening in iTunes, just un-subscribe and re-subscribe, and anything that's going crazy, that'll resolve it.