UMC404HD headphones only playing in right ear


Hi Everyone,

I have been searching all over the internet and cannot find anything that answers my question, So I am hoping you guys can. 

I have the UMC404HD, Audio Technica M50x headphones, Windows 10 and using Cubase 5.

All sounds whether it be live or return from daw seem to only come out the right ear of my headphones. I have a cheap set of odio headphones too that do exactly the same thing. Is their something I may be missing? or is this unit just faulty? 

The Stereo/Mono switch doesnt seem to do anything at all.

If I plug my headphones into the 1-2-3-4 play back outputs on the back the headphones work in the left ear but when in the front they only work on the right. 

I have tried sweeping the mix all the way to the IN an all the way to PB, pressing the Mono/Stereo switch, Switching between A/B, reinstalling the drivers. still nothing.

Any advice would be greatly appreciated.

P.s Does the headphone socket take a normal headphone 6.35 stereo jack or is it mono

Thanks in advance