No Hextech Chest after getting S rank

League of Legends Match History
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Hello, So before this game I have already earned three chests, and should have been eligible to earn one more. In the game I linked I received an S+ as Leona and my friend who I queued with earned an S- as Jhin. My friend got a chest (he also had 3 chests from the games we played together) but I did not get one. Could it be because I bought and opened one with RP? I didn't think this was the case because I thought you can only earn 4 a month, excluding purchasing them, but who knows. I feel a little cheated here haha, anyone know why i didn't get one or is this a bug?
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