I'm having the same issue. Using version 10.5.7 on MacOS and 10.2 on iOS. A shared note creates a duplicate almost every time when trying to sync from one device after changes have been made on the other. Very frustrating. I have deleted the notebook, emptied the trash, made a new notebook (different name) and different notes (different names) and still the dups appear. I have loved evernote for a long time, but am now looking at alternatives and may jump ship. This problem has been around for a year and still persists. Also, the removal of tabs in the new build was an extremely unwise decision. Getting harder and harder to justify dealing with all these issues.