Hmmm Yeah i guess thats a problem with the center of the particle board (inner part of the melamine) bending in because of its weight... Well, i just built a melamine rack and already cant wait to trash itSad right? At this point with so many snakes, its definitely worth it to save up for a nice professionally made rack (boahphile,animal plastics, vision, rbi)... They will most likely last a LONG time, you will never have any sliding problems, bubbling problems, nor sagging problems... I just cant wait till i save up my money to buy myself a nice vision rack, and some nice baby racks, so i can get rid of all my melamine racks, which are SO heavy and are always having problems...