Using a gun with a bugged perk in a manner that exploits the bug to your advantage is technically cheating.
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Prove to us this is a reoccurring issue... prove that it really happens aside from the time your buddy told you that he experienced. I'm assuming you were on a rant and he told you this happened to fuel your fire.
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If you can't control the "glitch", which was most likely a one time thing isn't cheating. I was doing HC a few weeks and shot off two rockets, looked at my ammo and saw I still had all my heavy. Should I have shot 2 at the wall to redeem fairness to the game? It's sad you're putting so much energy into an a small part of a video game, one that you're not even positive exists mind you.