Try parenting the car figure and all of it's props to a Poser primitive.

Then scale that primitive instead .

Had this happen before when figures were not created properly.

I can't actually tell you what's the cause because I never really bothered to disect the cr2 file. Must be some weird hirachy problem.

But parenting everything to a new "parent" object usually solved that problem. (Before you render, just turn the new object invisible)

 

BTW, scaling everything to "match V4" is a very imprecise way of making sure everything is "in scale" in your render.

You can usually google the real world dimensions of anything in a couple of seconds. Create yourself a scaling prop then and you can directly check the exact size of everything in your render in Poser.