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Object floating on the ground.

Hello all

I have an issue recently  when I use Vuforia ground detection in Unity , can you please help me to figure it out ? Thanks in advance .

The issue is when I was trying  to place an object to ground , the object is floating in the air.  Please check the video, https://www.youtube.com/watch?v=m3VrWclT98Y&feature=youtu.be

The video is recorded on iPhoneX which is running the Vuforia sample project from Unity asset store .  I just build and run it without change anything.

It doesn't happens each time I use ground detection , but like every three or four times.

Unity version is 2018.2.02f.

Vuforia version is 8.0.10. 

OS version on  iPhoneX is 12.1.4

Any clue to fix this issue would great helpful , I really appreciate it.