Logic creating disruptive duplicate regions after editing.

This is being posted after an initial question I had about Flex Pitch seeming to create a problem when I went into a lead vocal track to fix a flat pitch on a note. I would get these loud momentary bursts of previously recorded parts of the region, that also sounded very echo-y. As it turns out, Flex Pitch was not itself the root of the problem, but it revealed another problem to me. And that is detailed, along with my solution, below. Because despite my fix, I don't understand what was happening in the first place and how to avoid it in the future.

BTW recorded on a 2021 MacBook M1 including 64 gB of RAM. Running Sequoia and the most recent version of Logic 11.

What was happening was I had at some time cut some regions to make some edits on the track a while ago. However, it seems that somehow, other new regions, along with a slew of very short, self, created, millisecond long cuts began appearing over the top of the original track. Or at least the sound of the original track remained, although there were no visible regions when I dragged the edited regions out of the way to see if there were other regions underneath.

It's as if the edits truncated the rest of the original region to be edited. And these after some very short cuts between them, new duplicated regions appeared. I assume they are duplicates because where they overlapped with the newly duplicated track and some "invisible" audio parts of the original track seemed to remain.

Which were creating these short bursts of duplicated tracks of previously sung parts. Imposing themselves over some version of the original unedited track, somehow still playing underneath, as sound bursts.

The fix turned out to be was where these bursts happened was to delete all the edited cut parts and the very short cuts between them. And then dragging a short region from the first cut of original tracks out, where then entire performance remained intact, over to another regions where this was no longer happening.

Background noise in the original tracks was noticeable which explains some of the very short (and muted) cuts. Because there are other longer regions without singing, where I mute the track to eliminate the background noise. Because the very short bits were muted, I assume they were also problematic.

And I still now need to go in and doing some other edits, like pitch fixes, all over again as the original parts remained unedited as they were before chopped up into shorter regions.

What the **** happened here? Why was Logic doing this? A cut region shouldn't be creating duplicates unless I have something set wrong to make it happen. Or was there is some kind of glitch? I'm finding the same thing on at least one other backing vocal track as well. What causes this, and how can I prevent it happening in the future?