Inconsistencies in the weekly rating distribution

The Weekly classical rating distribution currently states that my rating is 1591, and that I am better than 70.6% of classical players. However the graph contradicts this, as it states that people at rating 1575 are better than 64%, and people at 1600 are better than 67%.

Le problème est signalé depuis longtemps. Il semble concerner l'ensemble des joueurs. J'ignore pourquoi il n'est pas résolu. J'aimerais savoir quel est le nombre correct.