Hello - apologies if this was already found. I've run across a strange bug when attempting to equip two champion mods on solar warlock. It seemed to happen most consistently when 4 fragments are equipped. It doesn't seem to occur on all weapon combinations - crafted weapons and exotic weapons tend to trigger it. Basically, I would have barrier and overload equipped on the artifact. I was running a crafted Submission and Graviton Lance so I could have both in a lost sector. I was running a Void subclass initially, and both mods were working normally. I retried the lost sector on solar warlock, and noticed the overload absent from the HUD when I loaded in. After testing, it seemed to go away if I had a combination of crafted weapons or exotic weapons that had a champion mod applied. Video attached for example. Apologies for the banter.