Sound only works in right earphone on ALL headphones

[Shub Niggurath]

It works fine with speakers, but with ANY headphone I try it only works in the right earphone. I've tried multiple inputs with the same result, I don't know what's happened.

 

[Barman58]

One thing that comes to mind, which is probably not related, but worth a check -

Are these headphones designed for Apple products? I know a lot of headphones are designed this way these days and Apple slightly modify the standard plug which can mean unpredictable results