the game has issue coordinating ships and they have sort of a remote AI of each ship on their own to try and act and react as individuals so thats why they tend to run over each other, they have no concept of waiting their turn and such.
also on occassion when you attack a task force you may get a light cruiser join the DDs making passes at you like they are DD or something but they are the only warship i have seen with that glitch