Unity scene "is loading" shows up after application quit

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Hi there,
I'm noticing something funny on the PUN basic demo scenes. After I stop the game, I see a second copy of the scene with "(is loading)". I'm not able to unload it until I restart unity. If I play the scene again, now I have a third copy of the scene with "(not loaded)" showing up after the scene name. I'm attaching a screenshot. Any ideas what is going on?

Screenshot
https://drive.google.com/file/d/1jKn9167fijRywsRNL54UKgVDOGFUXqXM/view?usp=sharing