Exactly, the bug was in the threshold. While the league page shows data from minimum 3 games, the rankings on the rankings page were calculated with a minimum of 4 game (3.33 actually, but rounded up). The rankings code was fixed now but it will take some time (most of the season) for the data to be corrected. We can force the recalculation manually but it would slow down the site considerably for a couple of days.