Thanks.
A support ticket was opened yesterday.
2 notes were created using the same IFTT recipe. All others (70) were created in the EN Editor, email, or ScanSnap > import folders on each computer and mobile device I use.
Public sharing is activated on each note. One note was addressed to an email address I'm familiar with. That note had edit and invite permissions. All other shared notes allowed viewing content only.
P.S. IFTT is now turned off. TBD if that's the fix. Tx for the suggestion 👍