There are 2 leaderboards in "Ultimate FreeCell Solitaire":

Score leaderboard

After every "Quick game" your score is stored locally. At the time you open the "Score leaderboard" it is sent to the "cloud" and you can compare your overall score with players around the World.

Challenge leaderboard

This leaderboard holds your score played in "Online Challenge" games. It shows your current ELO rating and your position. To read more about "Online Challenge" please tap here.