Bought 2 champions with BE and they are gone

Hi,today i played a game and one of my teammates told me he bought Teemo but it never appeared in his owned champs,his BE was gone and he didn't receive the champion.Thought it's some bug,but after that i went and bought Evelynn and Xin Zhao,my BE was taken away and i still don't own the champions... What the f. is going on?
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