Ok, so a once per computer policy is set to allow deferral. If a user selects a deferral, the /Library/Application Support/JAMF/.userdelay.plist file is updated with the expected key/value pair and array with user's selections. The deferred time comes, user runs the policy, and the key is removed from the file.
User is getting the deferral prompt once a day. We confirmed the file is empty, and the computer is not in scope for the policy. A colleague confirmed that there are no other policies with the deferral option.
Anyone else seeing this? Posting here for now, may open a ticket if the issue continues and we can't find the culprit.