Game Mechanics: Losing Stacked items

[jaileint]

This is how I can replicate this bug. If you have a bone chip (single one) in your inventory. Then, loot another off a corpse via right clicking (so that it automatically goes to inventory). The auto-inventoried chip will dissappear. It won't be added to the first one nor will it be added to an empty slot, it just is gone. This happens with all stackable items that I have seen.