[Affinity Designer SVG exporting wrong size]

The svg I used came from Arc GIS Pro. I exported it from Affinity Designer using the SVG (for export) preset and the whole document area.

Aquita Zarca.svg Aquita Zarca from Affinity.svg

[Affinity Designer SVG exporting wrong size]

I'm opening svg files from another program in Affinity Designer. They are exported as 7.5"x10" on a 8.5"x11" layout at 300 dpi. They open in affinity at 2.84"x3.75" at 192 dpi for no conceivable reason. if I then export the same file to svg from Affinity Designer it opens in Adobe Illustrator as 11"x14" on a 11"x17"artboard. It's just all over the place. Can I set the default units somewhere?