Having the same issue on M1 mac. I think my coworker sees it on an intel mac though. Some more people seeing issue in this thread: Multiple Figma apps open on MacBook dock
This is an ongoing issue our engineering team is aware of and are working on. We have escalated this thread for further investigation.
That said, our team suggests fully uninstalling the Desktop app (using an App Cleaner if you have one available), and then re-downloading and reinstalling from the Desktop App downloads page.
If it still occurs after trying this, can you try installing the Beta app version linked in the Guide to the Figma desktop app and check if you still have the same issue.