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!