Customise the gazepointer of google cardboard unity

Whenever the gazepointer gaze over the cube it should load new scene with the gazepointer use to show a circular loading delay animation effect and load new scene .The sample code link which i have to customise.

The following video tutorial explains how to set up an image as scope: The Making of Google Cardboard Games Ep. 3 - Find the Target - YouTube

Basically, you add the image with gazepointer to unity. Then, add an Image GameObject as a child object of the Main Camera. Add that image gazepointer as a component to the GameObject

I followed the same procedure. The custom image shows exactly in the center in the editor and when I play in Unity. When I check it on the phone, the custom target is offset and not in the exact center.

Am I missing anything here.

Thanks for the help.