ROFL!
I have had the same thing happening to me! I weigh myself constantly now, and I have gained weight. BUT, in the mirror I swear I am getting skiny. It is really un-motivating, espcially when you are going up weight on lifts, and eating until your stomach aches in the middle of the night.
I say this, if the weight goes up, and the scale goes up. Forget the mirrors!