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I have just played a ranked game in which I scored a quadrakill, but my Ranked Stats does not count it. I am absolutely sure it was a quadrakill and it can even be checked in my Match History, where it says that the Largest Multi Kill for my last game was 4.
It must be a silly implementation mistake easy to be corrected. Hope to have been useful
P.S.: I am not sure if it's a problem on PVP.Net or on the Game Client...