Ehm actually the leaderboard did update. But only counting my defeats. In the meanwhile I had 2 draws and 3 victories but those are not reflected in the leaderboard. This would create quite a bad mood for players.
Further proof that this happens. I'm losing against the same guy of league2 5 times in a row. First I get always the same amount of minus points (-11) and this cannot be because his score should grow every time and I should lose less and less. Second which K factor is used if me from league1 is against one from league2? Third, in the leaderboard I still have 10 games played when I played way more.