We're aware of an issue with Facebook purchases for all King Games and our team is on it. 🛠️ Hang tight while we fix things! You can still enjoy the game, and we'll keep you posted once it's solved.
Are these Boosters that you purchased? If so, then good news :) Simply click on settings and then "restore purchases" and you should find them all again. I didn't purchase the boosters, they were won by spinning the wheel - daily