Transmogs gone / Half disappeared

Since blizzard ‘‘doesn’t help’’ with these issues per their help page, i am desperate for some help on what to do.

On several of my toons, half, or entire sets of transmog are set as “known” however i cannot see them, or only some pieces in the collections tab. For example my paladin alt can only see the helmet, legs, and feet, of the S4 Dragonflight elite set, going to the vendor again and trying to buy the set simply gives the prompt “already known” under the item, if i buy it for 12 marks and re-learn it, nothing, items don’t show up

Edit: Did a full UI reset, removed addons, interface, wtf, cache, still nothing, can’t see transmogs that are known, both by the vendor and per achievement