humity warping my enclosure?!?

hey i have a pmherps enclosure thatis finaly set up well... kinda i got a repti fogger for my humidity and the front plexy glass keeps warping does nyone else in here have this problem with pmherps enclosure?

I have a small white abs enclosure with plexiglass front doors and I used to own a stack of 6 foot animal plastics with plexiglass front doors and everyone of them started to warp. I had to add support to keep the small one I still have in line. I prefer sliding glass doors becuase of the warping issue!