Hextech Chests

This has been happening for a while now, I think more than two months actually, but I havent been getting chests even after getting S ranks. Just recently I got either S or S+ for draven and got my tank 7 mastery but I didn't get a chest? Even in my banner were the 5 chests are located, they all show. I get keys just fine, I already have to fully forged keys, but still, no chest. Is there a way to fix this or is this a bug? Cuz I want to open chests....
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