Well when duplicating a weapon it doesn't duplicate the missile unit, it creates a new one without the actor. Go to the weapon and see what missile unit it uses, it will probably be named a copy, then find the original unit, the same one with an actor and duplicate that one yourself, he will have an actor then, but the model wont work you'll have to reassign the same model the original actor uses. Then assign that new missile unit as the weapon's missile.
About the interceptor weapon, it is what causes the interceptors to move around the target of the carrier in that fashion, its not a behavior they have or something, about removing it I don't know how. It might be in the damage display effect, but I'm not entirely sure.
Well when duplicating a weapon it doesn't duplicate the missile unit, it creates a new one without the actor. Go to the weapon and see what missile unit it uses, it will probably be named a copy, then find the original unit, the same one with an actor and duplicate that one yourself, he will have an actor then, but the model wont work you'll have to reassign the same model the original actor uses. Then assign that new missile unit as the weapon's missile.
About the interceptor weapon, it is what causes the interceptors to move around the target of the carrier in that fashion, its not a behavior they have or something, about removing it I don't know how. It might be in the damage display effect, but I'm not entirely sure.