Could it be mold?

@Purple-N-Hairy @Foreigner @Gpaw @TopicalWave @Neb I heard your advice, I cut the 2 florets, in fact yes, I think it is Botrytis, thank goodness I noticed it in time, the other plants are fine but tomorrow I will check everything for good!
Why did this happen? I have the extractor and the ventilation is active every quarter of an hour, the humidity is at 30%, I don’t understand!

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