I did mkve the adhesive to the centre (best on my last attempt). I have attempted applying a screen protector 3 times. The first time I had to tip the tray to force the glue to cover the bottom. The sexond time the glue would not reach the top part. I checked the surface I used was level. The third time I got a better distribution of the glue. The point is that cases seem to lift the screen protector on the edges just where at the top and bottom you'd expect less glue. Ideally the screen protector should have some glue already applied at these weak points as used by standard protectors.Save $5 by getting the version without UV light
Did you do the tipping motion to move the adhesive to the middle before dropping the glass?