Game dismantled one of my items from the post-game rewards screen.
I accidentally equipped a chestpiece. Then I clicked "dismantle" on the same item I'd just equipped. The game went and deleted the other item from my inventory; when I went to go re-equip the chestpiece I wanted, it was gone!
WTF!
Yeah, I've been complaining about that bug since closed beta. Holding right stick to dismantle selected stuff should NEVER dismantle what you're highlighting as well. Only the things you've "added" to the list. It's a horrible design, especially with the lack of locking or favoriting gear.