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Object moving along with device.

I have gotten the basic ground plane functionality working in Unity as from vuforia guide link,

https://library.vuforia.com/ground-plane/introduction-ground-plane-unity#ground-plane

and can place an object on a targeted plane.

 

But when I place other object on the ground plane,  and then move around the object start moving forward along with device. See video here

How can I make the object remain stable with out moving ? We are on app release and need to solve this as soon as possible, so any help/ assistance will be appreciated. Thanks.