loot bug?

I had a total of 5 games today, all matchmade games, and 4 of those where Winns, bit i diddnt get a key so far, is this normal? In addidtion, i played some games on, SR and a teammate reached a new rank, on a chamion i also own, but diddnt get a chest eighter (lost game). is this the way the System is supposed to work?
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