Putting something up for sale, then removing it again deletes the item it seems?
Also doesn't count the items.
I have 2 pistols, click to put one up for sale, still have 2 but one is now in the trade window. Click again and now both are in the trade window, I have none. Change my mind, want them back, click them, they disappear. I don't receive them back.
Cancel the entire trade, check inventory, no items. Still deleted.