at the power station in Electro we had a gunfight and won. The three other People were dead (my character too), my friends try to save my loot and the loot from the others, but after a few seconds (10) all 4 body disappeared including all loot( the loot that they placed in environment disappeared too).
One Houre later. we killed one of our character to see, if this will happend again. and yes every loot from him disappeared.
(we had this problem not every Time. it appears randomly.)