Here's an issue I hadn't seen until 4.1.1
It only happens with some models. This one passed the repair checks so I think the model is clean. If I open the factory file in an older version they come up with the same offset, but I don't recall this happening when using those versions.
No, modeled in inches. Thus the 2540 scale factor. The minor adjustments on the X and Y scale are calculated to account for machine and material behavior resulting in dimensionally accurate parts.