SVG Export Wont' Scale Correctly

When I try to export some curves as SVG file, the scaling is all wrong, and the scaling changes when I change the size of the paper. I have similar problems when trying to export as vector PDF.

I also can’t manually adjust the scale factor on export under Custom. There is no change to the image when I change the numeric value of the scale factor. If I select another scale factor, like 1:2, then it does change.

If I export the same curves as a separate Rhino file, then open that file and export them as SVG, things look a lot better.

Can you please provide a sample file and the details for scaling you’re trying to achieve?