I encountered the same problem - edits to existing notes were lost. Problem with duplication of notes being edited also recurred, resulting in notes conflict. Iphone 8, iOS13.7 & Evernote 10.0.4.
Same here. There is a new copy of the note created with every pause of my typing on the original note. Logging out and logging back in again, as suggested in some posts, did not fix the problem for me.