Does that make any sense? I cannot figure it.
As above, that should be impossible with the built-in microphone and speaker.
One more confirmation test. Select one place in the blue waves with sound. Use the Magnifier Tool and keep clicking on that one place so the waves get wider and wider. As you view closer and closer, you should see the up and down rhythm of the two waves are mirror-image of each other. They’re supposed to be exact copies.
You can fix this in Audacity, but the effect is so totally not supposed to be happening in the first place.
It’s one of the horror movie problems. You send a performance file to three different clients and one of them can’t play it for no known reason.
This is the adapter from Hell which can produce the same effect.
If the magnify test showed a mirror image, here’s how to correct the track.
Drop-down menu on the left > Split Stereo Track.
Select the bottom track by clicking just right of the up arrow.
Effect > Invert
Top track pull-down menu > Make Stereo Track. That should play anywhere.
Koz