This issue seems to also affect the stroke style modified by percentage:
New report: https://bugs.launchpad.net/inkscape/+bug/1670913 "Scaling stroke width by percentage gives wrong stroke width"
Recent(ish) report: https://bugs.launchpad.net/inkscape/+bug/1673096 "Stroke width can not be adjusted in percent from Stroke style tab"
TD
This issue seems to also affect the stroke style modified by percentage:
New report: /bugs.launchpad .net/inkscape/ +bug/1670913
https:/
"Scaling stroke width by percentage gives wrong stroke width"
Recent(ish) report: /bugs.launchpad .net/inkscape/ +bug/1673096
https:/
"Stroke width can not be adjusted in percent from Stroke style tab"
TD