I unlocked the TM-Moss helmet (finally) and am unable to purchase it with a synthweave bolt as it doesn't appear in that tab. I do not have the helmet on and I can confirm it's unlocked in my collections.
My concern now is that even if I get the helmet a second time in the dungeon, it won't appear as a purchasable option with the synthweave bolts as I've already unlocked it.
Any help would be appreciated.
Best,
This happened to me too and someone pointed out that if you’re wearing the helmet, it won’t show up in the transmog. Put a different helmet on and it should show up for purchase.