Yes, I'm experiencing exactly the same problem which prompted me to join the forum.
I was 1st on the leaderboard for Kings crown casino but it seems as soon as I hit 60M in winnings suddenly I started losing random amounts even if I manage a second place.
At the moment unless I come first I lose 3.5M and other times it seems to be a random amount. The algo should take into account buy-ins as well to give a more accurate representation but that's a separate thing.
It's no big deal, but it clearly does not work and it's a bit bizarre how the total winnings keep heading south even