my audition displays stereo tracks as if they were mono

Thanks for the follow-up. Since your export sounds fine in stereo, the audio itself is good — this is just how the session is displaying it. One quick isolation test: create a brand-new multitrack session and drop the same file in. If both channels show there, the old session's tracks are the culprit — check that the track headers say "Stereo", not "Mono". Let me know what you see!

Good news: I watched your video, and the audio itself is fine — in the Waveform editor (around 0:56 in your recording) the file clearly shows both left and right channels. So this is not a bug and the files are genuinely stereo.

What I can see in your Multitrack session is the real cause: those clips are sitting on mono tracks, and a stereo clip placed on a mono track plays and displays as mono — which matches exactly what you describe (half your audio "turned into mono").

The fix: add stereo tracks to your session via Multitrack > Add Tracks, choose Stereo, then drag the affected clips onto them. You can spot a mono track by its meters (one meter = mono, two = stereo).

Adobe documents the mono/stereo track configurations here:

https://helpx.adobe.com/audition/desktop/mixing-multitrack-sessions/basic-multitrack-controls.html

Let me know if the waveforms show both channels after moving the clips!