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Hi and Welcome to the King Community
Sorry that happen to you , Boosters are saved directly in your device's memory, which always allows you to use them while playing offline. This also means that if you delete and reinstall the game, then Boosters can be lost and just saved Levels.
It’s best not to store too many Boosters on your device, as there is a chance they may be lost, or affect the game play. and save your game in Facebook and King Account.
Please check links bellow about lose booster!
Or please email this to our Player Support Team here
Hello @lmross69 your profile being saved in a King account doesn't include your boosters. The fact that when you restarted your game it was at level one would indicate that the game crashing deleted the app history. I say this because when you sign out of your game and open your game it always starts at level one, and you have to play a level to restore your progress.
There are many reasons that can can cause your game to crash and unfortunately some of the reasons can be caused by your own device.
If you bought any of your lost boosters King will replace them. If all of your boosters were just rewards from various game features then it is highly unlikely that you will get them back, as King make it clear that they don't replace 'free' items that go missing.