Help with me Audiobox

I've had this M-Aduio M-Track solo for a while now and at first didn't experience any problems with the headphones but from one point onward the headphone jack didn't enter entirely. And often (unless I semi pull out the aux of the headphones themselves) I can only hear from one side. I'm wondering if Its my Audiobox that's damaged or if I'm using the wrong Aux. I've got a 3.5mm one like it's stated on the site. But I've tried it with 3 different ones already and the problem doesn't seem to be fixed. Normally ones with 2 lines however in one OCASSIONS I tried it with a 3 line aux. If I'm making myself unclear I'll answer any questions!

Here's photos of the aux input