Languages best answerers?

just out of curiosity...have you taken a look at the ranking list for best answerers in languages? a couple of weeks ago someone named caicos turkey was number one and then he suddenly disappeared from the list...i mean i can understand he being overtaken and going to number 2 or 3, but at the end of the top ten list there are people with far fewer points that he had...then the guy who was second after him (brahe i think it was) was number one for a few days but now he's disappeared too and now a Martha P is number one....I'm just curious to know how they can just disappear like that out of the best answerers list...