As I am inching closer to having a large number of XP / badges / locations, I have just noticed that the ranking displayed by my avatar on the top page is not correct. For example, for locations it ranks me as 16 at the bottom of each page that I am not on, but when I find the page I am on, my rank is displayed as 340. This problem is on all three main ranking pages, and the incorrect rank is always much higher than the actual rank.