AR game objects moving off image target

Hi All.

I created a simple AR app that displays a 3D room model over an image target of a 2D floor plan. I have everything working as I want; however some of the 3D models objects do not sit where they are in the scene and game views? ceiling and floor for examples are hovering above the actual model sitting on my image target? I've followed every type of tutorial trying to correct this issue but do not know what to do about this?

Attached is a scene view screen shot of what it should look like. When testing or actually built and run simply imagine floor and ceiling objects hovering above the model.

Thanks for any and all suggestions!

Rick...