I read similar topics that were created before but I got that in my notes as well.
When I import notes from HTML files almost all my notes were conflicted (If I am not wrong my notes been duplicated and one normal other conflicted note)
The second is I created a note from my iPhone and later I edit my note from my Mac and I saw this:
Above note I edited my Mac but below(conflicted version) is the same that I created from my iPhone
it is quite confusing so I deleted quite a few my notes so I am not sure how can I fix