The Nova Atomica deluxe skin has leg distortion issues. Her knees bend like straws when she does any action that bends her knees (crouching, using animation sets from frames with bent knees, blocking with melee, etc.). I recalled noticing this when this skin launched, but haven't played with it in a while and just noticed that it's still doing that.
In the spoiler I've embedded screenshots of Nova Atomica using animation sets that emphasize the bend, in order: Titania Agile, Nezha Noble, Wukong Agile, and Yareli Agile.