Saints Row The Third game breaking glitch

[futurefields]

I have to destroy the Stag Vehicles but for some vehicles the VTOL laser does zero damage. This is an obvious glitch, I beat this entire game on Xbox 360. Every time I go back to play the mission I get the same thing, some of the vehicles I need to destroy cant be destroyed

Really dissapointing.

 

[futurefields]

I was able to get past it by parachuting out of the VTOL and using grenades on those Stag Vehicles.