Legend of Poro, Ascension S rank reward not same as Hexakill?

Just wondering how this hextech thing is working For Legend of Poro King and Ascension it was: If you get S rank you get chest as a reward, why is that not the same for Hexakill? Got one S with Karma and two with Jhin in HexaKill, for a reward I've got keys two times of those three.. and third, nothing :|
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