yepp same here, first area to lift is the back side. i think it may be because i sleep on it. never tried glue anywhere else but the front... but today i'm gonna give it a shot, a full glue perimeter. we'll see how it goes. i hate it that i have a perfect attachment everywhere except the back side. tbh i still haven't perfected the shaving-my-hair bit. so i think i might be leaving the bit extra hair and the piece attached over it ... which obviously, explains the lift.