I cant find a button to make a post in the bug section So I figured I'd put it here.
Unkowen if you are aware or not but my friend and I Discoverd that when you trade someone,
By right clicking the item and hitting offer 1,000; Then accepting they ACTUALLY get 1,000 out of it. Even though you only had one.
You can also add more repeatedly-
Offer up 1,000 then right click on it in the trading area and hit remove 1,000; Doing this actually ADDS another 1,000 to the count.
I Traded my friend like 4,000 items last night. Even though I only owned 2.