Sequence Editor doubles composition length every time it's opened
I recorded today a two-person podcast episode in Descript Rooms. This was my first attempt, following a test. Everything seemed fine until I was editing. The gain levels varied dramatically, so I used the Sequence Editor to auto-level. After processing, the composition's length doubled. It added a full copy of the episode end-to-end. I then opened the Sequence Editor, clicked “Edit” but closed it without making any changes. It added another full length version of the episode to the end. I then did a "New composition from file" and opened and shut the editor with no changes. Same result. No change after quitting and restarting the program.
Descript v2.20.0, macOS.
I was able to complete my edits but want to figure out if this is a me issue or a bug for my next episode. TIA