PBE shop glitch

Whenever I try to buy something, it says that the price for it is the same as the usual league shop's. Like when I was thinking, "Oh, I'm in PBE so I can buy all of these champs for 1 BE", and after I purchase one, every other champ is set to the usual prices. I'm not sure if this is happening for anybody else, but yeah. Anyways, have a good day!