PO Confirm receipt WF Notification- Question and issue regarding

We have an expense PO for 1 line with need by date of 9/4/2015

This PO line was matched but not paid on 8/21/2015.   (no receipt had occurred yet)

That same line was unmatched so that the line could be cancelled and re-entered under another inventory org  (PO line 2) . This PO line 1 cancellation and PO line2 creation and re-matching to PO Line 2 occurred on  8/23.

A PO confirm notification was sent on 8/25  .        The user responded with  'Not Received' as the product had not yet been received.

On Aug 31, the PO was fully received.

On 9/23,   ANOTHER PO notification was sent.   This time there were different options-     The 'not received' option was not present,  only  Receive in Full, Notify requestor, Reassign, request information.