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Ah, oh, I might said this wrong in the past but your comment reminded me that we reward items from the last 36 hours, not 24 hours. So not a bug but a feature :)
This is a very good idea, because of the different time zones we live. 24 hours is not to much, in this case some really good posts / articles missed the zaps of community if it's posted when server have less activity (night), and in the time zone of author is 10 AM for exemple... So...rewards for a 36 hours period is great!