User blog comment:Sarah Manley/Try the New Wikia Editor/@comment-1474707-20110830095836/@comment-4337895-20110830140256

I know why. You have the full page's scrollbar, that allows you to go to the very bottom where you see adds and such, and then you have the editor's scrollbar, so you can scroll up without moving the page itself, just the editor. I hope that helped!