combining ground plane and image target failed!

Earlier I have completed a project which revolves around a 3D object(blender file)  and made it into a puzzle game by adding interactivity to the 3D object.I have added colliders for its child objects.Logical part is working fine except the 3D object is shaking severely giving a neightmare to me!

I have suspected that TrackerFound/TrackerLost functionality is toggling in or at random frames.When I searched for making the display consistant, sthought of SmartTerrain can solve my problem as it may have wide range of focus.While searching for that I knew it was deprecated and GroundPlane was introduced in Unity 2017.3 version.I have updated software with correct version and followed authentic webpages from Vuforia Development portal.

It proved more dangerous - a virtual havok!The capsule which I put as a child of image tracker is floating free in both TrackerFound and Tracker lost states.I have added a cube to the GroundPalneStage to check where that Ground Plane Stage is loading and wheher it is sticky or not.But The cube is also floating in the world and not settling any whaere on the flour of the AR world.I think It is following camera gyroscope and not fixed in position in the AR world.

SCreen structure is very simple as prescribed in those Tutoraials:

1.Directional Light

2.AR Camera:

*******Transform ffeatures

**************position:0,0,0

**************rotation:0,0,0

**************Scaling:1,1,1

3.Ground Plane Stage

*******Transform ffeatures

**************position:0,-0.467,2.048

**************rotation:0,0,0

**************Scaling:1,1,1

*******Cube1

4.Plane Finder

*******Anchor Stage = Ground Plane Stage

5.SceneImageTarget

*******Capsule1

6.Canvas

Why such simple content is unable to perform nicely?how could we progress even simple and nasic instructions are not giving the right result?