The glasses frame was accidentally deformed.
When the glasses frame is deformed, the eye distance, pupil distance, pupil height and astigmatism axis of the left and right eyes may change, which actually changes the parameters of the glasses. If the deformation is serious and allowed to develop, it is tantamount to matching a pair of inferior glasses.
Glasses frames are different from other articles and are not easy to correct. But the hair dryer and warm water heating at home can replace the professional heater to restore it to its original state.
If you are not sure, go to a regular optometry center or a place where glasses are fitted and find a professional glasses processor to adjust them. Never break it by hand, or it will be more deformed.