Headphone issues

I am on a MAC Air, version 10.13.6. I am editing with Audacity version 2.3.1. I’m trying to edit a sample audio for ACX. They want the sound recorded in mono 1. As I am listening back to my audio, I can only hear sound coming from one side (the right side) of my headphones and it is low volume even though I have it turned up to the max. I have tested the sound with many other things (youtube, itunes, amazon music, videos, etx), and I can hear audio coming from both and the sound is loud and clear. I have even tried a different headphones/earbuds (my Apple earbuds, and BOSE earbuds). The same thing happens with them all (sound only from right side when playing my audio from Audacity). I am attaching a screenshot of my audio recording.

Any help would be appreciated. I don’t feel that I am hearing clearly with just one side working and the volume being so low.

Screen Shot 2019-04-20 at 12.35.11 PM.png

You nearly cut off the clue. See way over on the left side of the timeline it says…ght.

Audacity thinks your single audio track is the Right-hand portion of a stereo track missing Left. This will, in fact play to the right side of your headphones. All headphones.

Right now, you can fix this with a little wacky wave management. Duplicate the track with Command-D. That gives you two independent copies of the show—two blue waves. Use the top track pull-down menu and Make Stereo Track.

Then use the same drop-down > Split Stereo to Mono. Not Split Stereo, which is how I think you got here in the first place.

Delete one of the two tracks. That should play to both sides of your headphones.

As an experiment, can you record a simple 20 second sound test and post it on the forum? Use this formula.