Rear glass lifting after vibrator motor replacement

Hi guys

I recently replaced the vibrator motor in my Xperia Z1 L39H and now after a few days, the top left corner of the rear panel will lift slightly, around where the camera is. I suspect the NFC pins are pushing it out and I have already tried a couple of different adhesive gasket stickers. I was also careful to degrease with 100% IPA before putting the adhesive on. Anyone else had this issue? I've seen answers relating to this happening when replacing the screen glass on a Z3 but not the rear glass of a Z1.

Any advice appreciated.