LOS - is it bugged?

Yeah, the weirdiest thing was when I go to the ships near BB to kill the three captains and I pulled the captains (and the half crew :DD) when I walked down mid stairs that leading to the maw of the ship only by agro range. Ok I get it, it’s a ship and the captain can hear me walking and slashing his mates and send reinforcements and himself to kill be, but please don’t come across the objects, it’s so ridiculous and crappy done…