About a week ago, the web version of Evernote started to always complain about unsynced changes. I have attached a screenshot. This occurs every time I try to log out.
It happens even when the note says "All changes saved" in the bottom right corner.
It happens even if you log in and then immediately log out without changing anything.
In my testing, if you log out, all changes were saved and no changes were lost.
I'm using Windows 10 Pro and the latest Firefox 105.0.1.