I've seen the same problem twice now. I created a brand new note and was only working on it in Windows version 10.22.3. To be clear - these weren't notes that I worked on and then later came back to. I had created it a few minutes before and was still actively working on it. All of a sudden, a message pops up that says "We found more than one version of 'note name.' You can view the alternate here." When I look, there are 3-4 versions of the note in the list, all of them identical.
What I've found is that if I delete the new versions and keep working on the original, it doesn't happen again.