I had no idea this was a thing. I have focused 17 xenotaph masks (the ugly trace rifle exotic for warlock) and every single one has a mobility spike. Ive focused four other different pieces of exotic armor all mobility spikes... I basically gave up. I've blown through so many golf balls. If i had known i wouldnt have wasted my time until there was a fix. But considering i still play invisible guardian destiny one day a week even after their "fix" im not sure i would trust them.