Great catch to whomever caught this bug, that's a tricky one to spot.

My best guess is that the payouts occurred while the matches were running. The runtime for all of the matches to finish populating is on the order of 10s of seconds usually, in my experience. The matches get populated from first to last, so you can often open up a match report for one of the games at the top a minute or two past the hour and see the top few matches with results and the bottom ones all showing 0-0 until you refresh a minute later.

So, if you also assume that those match gate payouts aren't processed until that is run, then you would have a window of time where the div 1 matches have paid out receipts and div 2 and 3 have not. If you processed the PL payouts during that window, I could see it having the same starting balance for the PL payouts and then also the matches that are halfway through running.

Just a best guess here. Good catch and glad it was corrected.

Do perfect scores no longer receive the full, unsplit payout each as before?