I looked at the “Joined exercism” badge this morning. It showed
1538644 members representing 100% of all users.
However, when I looked at the “Rookie” badge stats around the same time:
It shows that 453645 users represent 56.71% of all users.
The math doesn’t work: 56.71% of 1538644 users is 872525.01 users, not 453645.