Muscle tone not properly displaying in CAS and live mode

One more thing. When I place the Sim from CAS in an existing game, and she practices in gym for couple of days, only her upper body, like shoulders and arms, become larger and more muscular, which creates a disbalance in her body appearance. But, then when I save her to my library, put her in CAS, and click on the fat slider to "move it down", her hips and thighs now become larger and more muscular, as they should be.