I had a skin in my collection for years now its saying I don't, but says I own it

I have the Toxic Tyrant skin for Diablo for probably a year or two in HotS. One day I logged in and it said I didn’t own it at Hero select, I go to check and it says I own the skin but its telling me to buy it and its locked on the Hero select screen.

(I have a screenshot of it, but I am not allowed to post apparently.)

Sorry about that!

You can refer to this pinned post for more information about this issue here: Locked Skins and Mounts - #3