Waist and hip asymmetry is very common and can come from pelvic or rib-cage shape, posture, scoliosis, muscle imbalance, fat distribution, or prior weight changes. In the photos, one waist hollow does appear deeper, but photos cannot show whether this is mainly bone structure, posture/muscle, or localized fat. Exercise and posture work can improve strength and alignment, but it usually cannot change the bony pelvis or selectively fill or remove one waist hollow. If the asymmetry bothers you, an in-person exam with a board-certified plastic surgeon can determine whether conservative care, targeted liposuction, or sometimes fat grafting would be appropriate. I would avoid any procedure until the cause is clear and your weight is stable.