There might be a bug going on currently where if you are r(e)aching over to another tile to pick something up. If you are carrying too much and the game asks you to drop your weapon and you then say yes, sometimes that weapon will not drop where you are, or even into the tile you were reaching into, but it will drop 2 tiles away from you instead. Is there any chance that could have happened? Ive experienced that twice but not sure how reproducible that is, only had time to play one character recently.