I'd just lift the panel off again, and analyze the situation. Look for anything that might be applying pressure when it is installed. Wiring, lock parts, etc.
Note the location of all of the attachment points, and make sure all of them slot into their appropriate places. Reinstall it, and reinstall the screws that keep it from popping out. I'm guessing this is an easy fix, but one of those "slow and steady" sorts of things.