RE: Can't adjust headphones right

I'm having trouble with these headsets I bought.
They're not any special brand, just got them from the market cuz they sounded good, worked fine a few months but now I'm having trouble adjusting them, if it's not adjusted right I can only hear sound from oone side, and it's hard to adjust them right as when I leave my hand after plugging them in they mess up again. So I can't put them in the right direction without having to keep holding them.
Fyi I've faced this in the past aswell, so likely not my motherboard anyway.
Help will be appreicated
TO CLARIFY: I've tried them on another laptop, they work perfectly fine there. :/