I'm having a very hard time exporting line maps that end up looking and working correctly when importing into Inkscape/Affinity Designer. What I am trying to do in QGIS before exporting is basically this:
Set line stroke width > Combine lines into one > convert line(s) to path (Basically a fill without strokes) > Export
I understand that I am probably using the wrong vernacular for QGIS, but this is the best way that I know how to describe the process.
Even after rounding my "Join and Caps", it still looks weird and bubbly.