I don't claim to have a handle on this "car position" stuff, but I'd sure be willing to take a look at your file if that is allright. (Zip size must be below 6 megs)
Or send it in to Onecnc Tech support and then phone them for knowledgeable instruction. This last option might be best.
Or, Ward might happen along here with a good explanation all prepared so we can all get smarter together