An audio bug in macOS hasn’t been fixed in 21 years, despite Apple being aware of it, and users posting their frustrations with the bug throughout the years.
According to developer Fabian on X, this bug causes the audio balance on a Mac to shift to the left or right channel of a speaker. There are two temporary fixes — install Balance Lock from the App Store, or manually shift the balance to the center by going to System Settings > Sound > Output > Audio Balance.
