Hi,
I investigated this problem and came to the following conclusion. The display flat cable is lose when the screen arrives. You need to glue this part of flatcable with components with thin double sided glue tape 100% flat/tight to the back of the screen. Otherwise this cable with components will put a constant (small) pressure on the top of the screen to push it "open" . The chinese screens / displays have a thicker display glued to the touch screen so the space inside the frame is not enough. You need to double the adhesive seal for those screens (already mentioned some were above)
Alex