NGUI Clipping planes not working after changing child prefabs and saving it before running!

Hi i am using NGUI to clip my some textures in a scroll view but as soon as you change anything in the child prefab and save it the clipping doesn't work after that. Not sure why i tried to "Google it" but not able to get the exact cause for this.

MainGUiRoot:

Child:

And there is one more child which is attached Info_museum in run time where i changed the color of a font and saved it back to prefab. But once i do that clipping doesn't work can anyone tell me where am i doing wrong please thank you.