Small problem but otherwise fine

Compatible with my Panasonic Lumix LX-7 camera. Purchased to be able to take more longer-exposure shots, even in daylight. Does its function well, but unfortunately after a few uses, the glass Became a bit loose from the metal ring, so it jiggles around slightly ... I think there which Perhaps a glue or something used to fix the glass to the ring, Which might have become "unstuck". Does not affect the photos but that's the reason for docking 1 star.