CPlane different positions in two of my projects

Hi, I can’t figure out why the default (shift home) CPlane (grid) is placed on different locations in my two projects. I want to be able to copy between projects. But they have different 0,0,0. I have a command assign CPlane to object and use shift Home every time i want to return to the original location, but when I copy between the projects it is different locations.

Hello - I would explicitly set CPlane World Top in both Rhinos if you really want to be sure.