I had this same thing happen to me except I tried to sync a note to my phone that wasn't updated. It wouldn't sync, so I updated the note on my desktop about 11 hours ago.
Now I open the note and the version that I was seeing on my phone (pre-sync) is the there.
An answer came through, but I'm posting this in case there's an issue since it is unusual for the same problem to happen so frequently in a short period of time.
This was on Android. The web version is also the phone-version of the note so no luck there.