There is something odd going on with uploaded SVG scaling. In this thread:
TanneM273 uploaded an SVG file and the scale was ridiculously small.
When I uploaded a SVG file in response the SVG was small so I increased the scaling percentage (in the post) to 1000% to get it to a bigger size. The size did not increase linearly with the percentage entered. there seemed to be steps at which it jumped dramatically.