Hi, so for a mystery reason my sennheiser hd 518 headphones are only playing out of one ear, the left one. It started when i slid the right ear cup in all the way so I was only wearing the left one and the right was on top of my head. But when I pulled the right cup out it wasn't producing any sound. I've checked windows settings and drivers and all that and I have no idea what to do next. I am using a Steinberg UR22 interface for it and I haven't turned any of the knobs on that so I'm out of ideas. Any suggestions to try before I start saving for a new pair?