I can’t finish the mission for Hive Special Modules (the right one or the first mission) , i have try to kill destroyer with Iridium Slug ammo and use Figther R7 and Higer but when i come to the mission page and see my Progress it just not count my Destroyer kill at all! . 
It doesn’t register your kills?
Please take a screenshot of the ship you are using, with its full load out.
well yeah it’s not registry my kills it just like stuck on 0.
So! I’m glad someone notice that! ”) basically it seems that if you are using a fighter to complete the mission, none of your kill will be take in counts or only half of them for example if you kill 2 dessy in the same match only 1 kill will be take in count! It only happen with fighter! But then you’ll say: “but we have to use a fighter in order to complete the mission!” Welll actually no. You can use any ship you want and somehow if you use any other ship with iri slug all kills will be taken in count! Don’t ask me why! I have no idea! Probably a bug but it’s a nice one… kinda…mm