AirPods (3rd generation) sound leaking
my airpods gen 3 are leaking sound from the wrong hole
Did you already reset your AirPods, to rule out a software issue?
How to reset your AirPods and AirPods Pro - Apple Support
If this does not work, you should contact the official Apple Support by choosing the phone umber for your region form this Apple Support page:
Contact Apple Support - Apple Support
Or visit an Authorised Apple Service Provider or Apple Store next to your place: