Can't hear phone calls unless it's through rear speaker or headphones

Can't hear phone calls unless it's through rear speaker or headphones with k910

No right channel through headphone port on some headphones?!

This is a really weird one. On Apple EarPods, it sounds completely fine and like it should. With Philips Headphones, it is alright, but if I twist it at some angles there's only the left channel. Finally, with my new Brainwavz earphones, only at an extremely specific angle do they work?? I can confirm that it is only my phone that is having these issues as well... all 3 earphone/headphones work fine with other devices.

I have tried cleaning out the port with rolled up sticky tape, and washing it with tap water. Neither has worked so far...