Illustrator CS6 can not open exactly some svgs.
Please replace xx to your language and move to ~/.config/inkscape/templates/
.
<svg width="600" height="600" viewBox="0 0 158.75 158.75"...
When you drew 10px width stroke rectangle to stroke_bad.svg by Inkscape.
<rect style="stroke-width:2.64583325...
2.64583325 is nearly equal 158.75 / 600 * 10.
On Illustrator CS6.
Too narrow !
<svg width="600" height="600" viewBox="0 0 600 600"...
...
<rect style="stroke-width:10...
Correct.
Your svg should be viewBox="0 0 {width} {height}"
.
If you change default units (px, pt, mm, etc. ), viewBox will be changed.