Hi. I recently purchased a 15 inch MacBook Pro , however the computer does not sit completely flush on every surface. IN some surfaces like my desk , the computer moves around a significant amount diagonally. That means that the lower right portion of my computer rocks up and down diagonally with the top left portion of the computer. I have just gotten home from getting this computer replaced because the last one I had did the same thing. I notice that the computer rocks less and depending on the surface. the problem here is that if I place my room mates 13 inch 2017 MacBook Pro on the same desk it sits flush without a problem. I am very frustrated and do not know what to do because I really enjoy the computer but it is acting so weird. in some surfaces it does not move at all but in others it rocks up and down very badly.