Trouble with Corner Distort

Hello!

I'm having trouble with the Corner Distor effect. I've had similar issues with warp & distort effects in the past but just work around them. Now I'm not sure how to and think it would probably more efficient to learn what the actual issue is and fix it.

I used Corner Distort to make a Composition (two animated stickfigures, comp named "Whiteboard Drawing Small" ) fit the whiteboard. It works in the original composition (Composition named "Office Client POV" and even in a Compositon further up when in original size, but completly moves out of place when I scale the composition.

Why does it do this? How can I lock the distorted composition so that it is scaled just like the composition it's nestled in?

Thanks in advance!