I see, its same loadout as mine, maybe you got a ship kit that somewhat "is the way" for these huge hardpoints? I dont use any ship kits on my vette, but that was supposed to be fixed by now (atleast in odyssey). As all of ship kits have now hitboxes, and at some ships, certain kits was obscuring some hardpoint line of fire.
So if you got ship kits, try remove these and see if those hardpoints still fire. If that wont solve the problem, then I guess ticket time for frontier. Still that odd, cuz plently of cmdrs use vettes all the time, and you are seems only one who have this problem so far, otherwise would be surely more cmdrs who would had such issue.