@PSG never ever uninstall the game because, as you said, you will lose everything since they are only saved to your device. Always check here in the community or tag me and I can find out if it's a glitch or whatever.
Also to anyone that cares to answer how do some players have thousands of stored boosters? I am at level 5810 and have none. Any suggestions how I can get boosters because I am ready to uninstall it’s gotten to hard to play. I have been stuck here for a wk.