Why do MemRise learning courses get to the flower in fewer right answers than in Decks?

I may be wrong, but when learning a new word or phrase in say Italian 6, I notice that if I get all the answers correct, I reach full growth and flowering in at least one less question (growth stage) than on a Community course on Decks.

Does anyone agree? Have you noticed this too?
Is this policy?

@MemriseSupport

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