I've found the only way to (semi) reliably sync any notes edited/created from the execrable new Windows 10 mess is to reboot my PC... And even this doesn't work every time.
I have downgraded to the legacy version that I can actually sync notes from and that doesn't seem to have been prototyped and signed-off by inebriated chimps. I will remain there until Evernote re-integrates manual sync, fixes the auto-sync so that it ACTUALLY auto-syncs occasionally, or I get so fed up with Evernote's apparent self-destructive madness that I just suck up my distrust of all things Microsoft and migrate to OneNote...