This may be because cityquiz.io encourages you to find all the capitals with acheviements, but the thing is that they also encourage to find the biggest cities, so it's hard to say if it bias it...
The stats of Wichita are actually boosted because it is more or less given as an example in cityquiz.io... But even with this help, it's still "only" the 25th most guessed city up there haha
I think i'm gonna create other quizzes like this one in the next weeks
This may be because cityquiz.io encourages you to find all the capitals with acheviements, but the thing is that they also encourage to find the biggest cities, so it's hard to say if it bias it...