Unable to buy Blood Moon Siver chromas on PBE.

I bought the Blood Moon Sivir skin, but when I go to get the chromas, it tells me I must own the skin first. The skin is in my collection. Is anyone else having this issue? I tried to file a support ticket for it, but I got an error when I attempted to submit the ticket, so this is the only way I can think to make the problem known. Please help. I would like to be able to get the chromas before I can no longer get them for blue essence.