One of the two main side pieces (with the legs) of this product was incorrectly manufactured. It was missing the necessary pre-made holes for the screws and wood pegs to go into. It was also slightly taller than the other side. There was no way I was going to bundle everything back and try and ship it back in for a return. So I was forced to use all purpose construction glue on several places in order to make sure everything fastened together efficiently. Seems to work for now. 
I have never had an issue with Wayfair before but this company that makes this particular cabinet clearly lacks quality control. It's a shame too because otherwise this cabinet is fantastic. Everything I wanted it to be.