There’s another topic for this, but replies are no longer allowed.
The suggestion was to exit the game and restart, and when I did that (within less than a minute), I was already back at #4 in Canada again. I had #3 but it wasn’t showing.
The leaderboard only update periodically not constantly.
If you tap your face or whatever it shows the live standing.
Main reason I can tell is for server capacity… imagine if your device and every other players devices were constantly retrieving the leaderboard data… Nobody would ever get to play!!