some things / bodies are wrongly weighted because Larian changed their mind half way into EA and forgot to go back and fix their templates
every now and then you come across an item [rocks are common] that is too heavy to move with some tressure behind it... the better ones are when you find a dead body that weighs like 2oc so you can pop them in your pockets
its their default engine settings behind it and play testing is how you find these mistakes
