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Sorry to hear that @rlrifle
Have you tried signing out of your game, restarting your device and then signing back into your game.
If that doesn't work then I would imagine you have lost your chance to compete.
The issue of the disappearing leaderboard has been occurring since the start of the competition and even though it is being investigated by King it is plain from your issue that they haven't resolved the cause of the issue yet.
The shame of it is, is that this issue has happened on previous events and even previous All Star events so it is extremely disappointing that King has let this issue reoccur.