What is Wrong!

I've been going through my data and I can't figure out what I'm doing wrong.  The most likely answer was that I did my CCD transformation equations (the ones where I accounted for differing equipment) wrong, but I keep going over and over that and it's not working.  Historically, the U band pictures I've gotten haven't always been the best, but I've never had trouble with the B band.  Most likely, the problem is with the B band, because I need the information from that for the CCD equations for the U band.  If the B is wrong then the U is definitely wrong.  But where did I go wrong!?