See title. When I right click one of the added slots near its center as I normally would, I am given the context menu for the item to its right. I can grab the correct context menu if I instead click close to the left edge of the slot.

I have a belt, a holster, and a mining helmet equipped in addition to a tier 3 Alice pack for a total of 14 numbered slots. (The order in which I equip the hat and pack does not have any effect.)