Thickness and some other properties of certain curves/lines are not preserved

[lxkurko]

I have some diagrams in EMF format and when I convert them to SVG using this tool (downloaded and compiled from this repository), the thickness of some curves is not preserved. Also, some dashed lines seem to be solid.

Examples here:
https://mega.nz/#!ssJ2FbpC!GqC2y5AmWq19XkwBCkmszd1AWzxeswBYYtD1f9fM8wE
The package contains an EMF file, an SVG file converted using this tool and another SVG file converted with Inkscape.