It looks like the leaderboards were just changed. The one linked to from https://www.codingame.com/multiplayer/clashofcode by clicking on “my ranking” just displays the general leaderboard now. It looks like it just needs to link to https://www.codingame.com/leaderboards/clash/global instead.
You’re right, we’ll fix it asap.
I saw that a leaderboard tab was added here that links to the correct leaderboard
but when you click on “my ranking”, it still links to the broken old leaderboard