Thanks for reaching out Jmhohensee,
It sounds like you're having some trouble with your headphones. We can help.
It wasn't clear which headphones you're using, or what type of media you are playing, but some of the details you've shared may give an indication of what might be happening.
You mentioned that the content is not heard on one side when stereo is used, but mono works fine. This could indicate an issue with the way the left and right channels are encoded in the media. This could be either intentional or unintentional depending on the media you're playing, either as an acoustic effect to make the playback more immersive, or it could indicate missing or damaged audio. Without knowing the source material it is hard to say.
Since mono does work, we know it's not a hardware issue. What are you playing exactly? This will help us better understand what is going on.
Keep us posted.