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To be honest Samuel nobody seems to know what is going on with the All Stars event.
People are complaining about the missing in-game registration form and the missing leaderboard, but no one has any factual information to tell us or a fix that will keep people in the competition.
The issue of the missing leaderboard is being investigated, but past experience tells us that this will be if no help to those people without a leaderboard as the investigation probably won't be completed before the first semi-final has finished.
Try completing a new level and try signing out and into your game.
If neither of those methods help I am afraid all you can do is see if King fixes the issue and hope that any candy you are collecting is being counted.