It looks like there's an issue with the event called Top That!, and some players have reported the challenge suddenly disappeared from their game or that they have lost their progress in the event.
Sometimes things don't go as planned in the Kingdom, but please rest assured, we're already working on it! Our team is doing everything we can to resolve the problem quickly so you can get back to enjoying your game.
Until then, please try to play the event on only one device (only on your phone, or only on your tablet...), as that might help.
We’ll keep you updated in the Candy Crush Community.
Thank you for your understanding and patience as we work to fix this issue as soon as possible.