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Timo, it's not a bug. King run promotions that don't always go out to every player.
In the help section of the site, this is what it says:
From time to time we test temporary new features in our games, this is rolled out to a small selection of players. The selection process is completely random. If we decide that a new feature will remain in game, it will then be rolled out to all players.
I hope this helps