Loosen the hex bolts on the left edge of the faceplate a little bit (us a 2.5mm hex tool). That will keep the button from sticking against the fascia.

You can either leave them loosened, or you can fiddle with the position of the fascia and tighten them again. Important: Do not tighten them very much or you will crack your fascia and/or lens. They should only be "finger tight" at most.