This mod adds some equipment such as the Enchanced Shipments, in which you place an incompatible item inside and that item gets automatically moved back to your inventory, if you pick up the item from the equipment before the item goes back to your inventory the equipment will still send that item to your inventory, effectivelly duplicating that item since you'll have that item in your cursor and your inventory, you can duplicate almost every item as many times as you want, this could easily be fixed by removing the "automatically return incompatible items to inventory" feature, I look forward to a fix for this game-breaking problem.