I've sold couple items (Warrior's Fury body parts) to the merchant (NPC), then reloged into other toon and sold some ornate items from writs. The warrior fury set collection is still empty for me (no known pieces). This happened first time, all previous sold items were is set collection. As warrior fury is not a common set, but comes form AP boxes, this bug hurts... look out, do not sell items before binding it. It is longer, but safer route. PS4 EU.
Items are pushed out of the buy back list. I sold a lot of ornate items - I know how it works, like stated before it worked in the past. It didn't this time
Bind them first then sell them. Only bound items reg in set collection.