I have the same issue, and now the number of “unsyncs” is being limited so I’ll soon be locked out of my account if the bug is not fixed.
Evernote support, you here?? It’s insane that you have a bug like this and only premium subscribers can even contact email support.
i only have a laptop and a phone using Evernote, there is no third device and the bug is happening for me with my phone showing up as two different devices. It happens repeatedly every few days after I unsync the duplicate.