I did an update and have lost all my boosters which I had been saving for hard levels.

Lorna

I uninstalled and did a reinstall, however all my boosters are still missing.   The reason I did the update was that I was not receiving lives from certain friends

aCe

The issue with the lives seems to be ongoing but as for losing your boosters, they are attached to the app so by deleting it, you deleted all of the app date as well. Its happened to us all. Look: 

https://care.king.com/en/candy-crush-saga/why-did-my-boosters-disappear