Not sure if all NPC's but when talking to Fredar in Hunter's Edge, I bartered with him. I added his Large Health potion and an item of mine that was cheaper, meaning I still owed money.
I clicked the scales button and it removed money from my inventory directly. It did not put it in the barter window and I did not get the money back after canceling the transaction. I tested this and watched over 20,000 gold disappear from my characters while not getting any items in return (because I never finished the transaction, and the the money never went into an item slot in the window).
Item I added to barter was Heroic Jack of Plates worth 320. Large potion was worth 534. When I click the scale, I immediately lose 214 gold and never get an option to get it back... plus I still haven't put any money towards finishing the transaction. (and I lose 214 gold with every single click in one transaction)
Edit: Same thing happened to Arhu (cat form) in the same village. I just added rez scrolls on his end and when I clicked the scales to add my cash, it immediately deducted the money, and I can't get the scrolls because it doesn't put the money in the trade slot. Every single time I click the scrolls it deducts more cash permanently.
