The short answer is usually that "Bloodsworn Judgement happened." Bloodsworn Judgement reads, in part: "Flip the top card of the title deck and put it under the villain target with the highest HP with the title effects still visible. If there are no villain targets in play, discard it." That means that any title can go under a villain target (often Kaargra Warfang herself), including titles that usually only go under heroes (like The Living Weapon or Chaos Lord). Also, on Advanced Kaargra Warfang's flip side, she gains two titles at the end of her turn: "At the end of the villain turn, the top two cards of the title deck are revealed and put under Kaargra Warfang's character card, with their effects still visible."