Issues with in game sliders

[Luckyseven95]

 Whenever I try move the slider around, aside from thin, each side ends up deforming my character's butt. 

Thin:

https://s31.postimg.org/cy81fdzgb/ScreenShot0.png

Large:

https://s31.postimg.org/ylwzptzuj/ScreenShot1.png

Muscular:

https://s31.postimg.org/efthqy46z/ScreenShot2.png

 

 As for the body, I'm using the Atomic Beauty body. Any help in resolving the issue will be appreciated!