pixel_player30797997 see this post from MartinSchulz. PF states it's about delays with the server.
Edit: here's the copied text from that post
Regarding the leaderboard :
“ I had X medals and I was in the lead, and then the second player in the leaderboard has caught up with the number of the medals, matching mine and was given my rank”.
This is just a visual error as server does not update the game client immediately, but at the end of the competition.
However, we do understand how infuriating and frustrating it is to witness it and we will do our best to fix this so they will be always displaying the proper score and ranking.
