Scrollview mask not working (cropping) the content! (using Android)

alt textPlease take a look at these images I attached.

The scroll view is working properly in Scene View but not in Gameview
There are no material attached to the scroll view, the view port or the content. I saw a couple posts about materials, but I’m using none. Should I be?

Also, when I build and load on the android tablet - the result is the same as you see in gameview - it simply does not crop the content as it should.

Please let me know what to do.

Try change

Assets/Vuforia/Shaders/VideoBackground.shader
Stencil {
                Ref 250
                Comp Always
                Pass Replace
            }

Source:
https://developer.vuforia.com/forum/unity-extension-technical-discussion/vuforia-5010-broke-ugui-mask-component