Playback suddenly distorted

I’m using Audacity 2.4.2 on my 2020 macbook air running Big Sur.
I recorded my audio without any problems and had been pasting bits of dialogue from various takes into a new audacity project. Everything was fine and the playback sounded great.
Then, all of a sudden the entire project sounded distorted like an old time radio kind of. I had just been copying and pasting, not playing around with effects or anything. The other projects I had open at the same time, and that I was copying and pasting from sound normal. I tried copying a piece from the normal sounding project and pasting it into the distorted one and as soon as I pasted it into the project, it sounded distorted as well.
I pressed Undo to undo the past few things, in case it was something I had inadvertently done, but nothing changed.
Attached is a screenshot of the project, and an audio clip of what I’m talking about.
Thank you for any help you can offer!
Screen Shot 2021-02-01 at 11.39.11 AM.jpg

You’ve set your “Project Rate” (bottom left of the screen) to 4410 instead of 44100.
– Bill