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Hello Dribbeltje Konie, Unfortunately this can happen with new upgrades here is an extract from one of the King care team answering this same problem in another post:
"Lives in the game are not collectible items. The game is designed to be played with the 5 free lives and a few more that you get sent each day. Lives, along with boosters are saved directly to your device's memory and sometimes by deleting and reinstalling the game or with an update of either your device's operating system or of the game itself, boosters can be lost.
For this reason we never recommend storing too many lives or boosters on your device as not only is there a chance they may be lost but they can also affect the game play.
Lives in the game refresh for free so you are still able to play and enjoy the game."