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Hello Vicky,
In some levels it's not possible to use all of your boosters so they will appear greyed out in the selection screen.
If you have any doubts or if the issue is different then please post up a screenshot so that I can take a look for you.
Kind regards,
Johnny
No I meant the candies you collect in every level and when you have collected enough you get free boosters.I'm sorry I didn't explain it well.