Why won't my OP-1 have stereo output?

So I have asked a similar question a while ago, where I thought audio was only coming through the right channel. I have finally realized that I can get audio from either channel if I go into the master out window and turn down either the left or right channel, but when L and R are turned all the way up there is no audio. I don't have any effects on my channel and I haven't panned anything in the mixer.