Can't choose my VS reward ?

In the lol client, in the VS tab, choosing the reward prompts a box to validate your pick, but clicking "Yes" does nothing but close the box. Reloading the client didn't help. What's wrong ? Edit : i finished missions during last week, I don't recall choosing a missions path lol, and I just spent the tokens on icons rewards. Was that the reward I'm trying to click to unlock ? I was off when the event started so I have no idea what this event was about :p
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