I have started experiencing this problem, again, after several months.
10.33.4-mac-ddl-public (3285)
Editor: v144.0.17818
Service: v1.49.2
In the most recent case, I created a new note, from a single laptop (an M1 mac, possibly slightly different version of EN) to take notes during a webinar. By the time the meeting was over, I had more than 3 duplicates, each a little different (as mentioned by others). Slightly flakey network may have been a contributing factor, but other than that, this seemed like a very simply use case, yet EN created a lot of extra work for me.