This was not a private match.
Evidently, any difference of 4 levels either above or below, do not count, (No Points). It is the above part that irritates me. I beat someone 4 levels above and got zero points because of this flawed scoring system.
I can assure you that you will never get the 'no reward available' message from a laddermatch (when you click the button to get a random opponent) and it never gives opponent more than 4 levels higher than you.