difference between node editor position and c# GameObject transform.position

Hello,
I have put in my scene a sketchup component with several floor lamps.
My car should move on a way corresponding to the projectioon of each light.
But the GameObject.transform.position I get in my c# code is different from the values displayed in editor inspector.
Any idea ?
Best regards

 

I have testes with objects attached to root of the scene, and there the transform.position is good.
It seems that objects belonging to a sketchup-tree don't give a correct absolute position.
Any idea ?
Best regards.