Comment by advisedwang

Channel issues are like 90% of issues like this, but it's not always user error. Often a cheap production will just ship the front left + right channels as the stereo mix, instead of down mixing all the left + center channels into the stereo left etc. This is endemic in back catalogs on streaming providers where the catalog is a bulk assets that nobody reviews and is passed around between companies that don't care about the quality they deliver to each other.