Possibly a sync issue- Recently looted an oil barrel. I placed the barrel in the vehicle inventory, and one of my squadmates removed it after getting back to base and placed it on the ground using the left click toggle placement function. (not dropping it in vicinity) After he did that the oil barrel remained in the vehicle inventory but was also in the game world where he placed it, only now nobody can interact with the barrel in the vehicle inventory. It just takes up space and cannot be removed or interacted with in any way.