Reminders being sent after documents signed

A signer that had completed the agreement has been receiving reminders to sign, even though the document has been signed.  The text in their email reads:

XXX has requested that this reminder be sent after you have already signed this document.

Click here to view this document online in your Adobe Acrobat Sign account.

I can't figure out why this would send, and why it's not available in activity?

Also can't seem to delete the agreement?