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As there doesn't appear to be any way round it I think we have to assume it's a glitch. Oddly it didn't used to happen on Facebook and king.com so that was the way round it in the past. I've just played the level on king.com and it now does so that's scuppered. The only practical suggestion I can make at this point then is to use the lucky candy booster (the one with the tick on) to make up the shortfall.