Not exactly a “bug”, but close…
(And probably discussed before, but I couldn’t find it by searching the forums so I post just in case).
When I try to click and drag an item between two windows (most common would be from inventory to stash), the game registers all the path in between as a succession of clicks, and I often end up accidentally talking to someone or just moving away.
I totally understand why it happens (the game registers a continuous left button hold as a succession of clicks for movement purposes), and I have no idea how it can be fixed…
Yet I don’t remember seeing that in any other game, so there has to be a way.
I suppose you could just make the stash or shop window open next to the inventory to have no “in between” game space.
Bit of a band-aid solution, but band aids sometimes help. 