Take both AirPods out of the charging case and connect them to your phone.
Go to your phone, open Settings, find Bluetooth Settings, tap the paired device, and tap Unpair.
Put the AirPods in the charging case, reset the AirPods, and pair them with your phone again.
If it still doesn't work, it can only be repaired after sale. The maintenance strategy of airpods is to replace the damaged parts of earphones separately. Your earphones are R-end earphones that are abnormal, you can provide the purchase voucher to the apple store or apple authorized service provider for warranty or paid repair.