(Bug Report) Skin not Buyable

I don't know why some few skins don't is buyable on PBE like SKT T1 Azir, El Leon Gnar, Arcade Ahri, SKT T1 Alistar, Deep Sea Nami, Thunder Lord Ornn, Pool Part Taric and others. Why cant i buy them, and when i buy random skin chest on shop i just get and error message but i don't hvae all skins?
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