I had a question concerning this a little while back. I was having kind of the opposite problem with people being displayed on the productivity report more than once. if they had two task for the day they would show up on the report twice. three task - three times. The advice I was given was to add the green link on that query to allow the DB to know which individual tasks unreported time when with which task. Creating that link solved the problem so that no matter how many task an associated does in a day they are only placed on the daily productivity report once.
Code:
https://www.accessforums.net/showthread.php?t=74442