Champ mastery 6/7 bug

I just had two ranked games with zyra. in both i got an S- rank. So far everything is good. The first game completed lvl 5 on her and showed that i recived a token for lvl 6. The next game showed the exact same message, yet i only have 1 token in the crafting window. Is this intended or bugged or whats going on?
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