[This has been logged as a ticket, but logging it here as requested by GM Nalloruleq]
I went to purchase Eight Views of Defense against Hostile Runes at a cost of 565 Kej from Violesca in City of Threads, but I ended up with two copies and it used 1130 Kej. You can’t refund the item as it says “The merchant doesn’t want this item” and I can’t use the item as it says I have already used it.