Ok, I understand. I guess I have to say I'm stumped, for now.
I guess that Options button in the bottom of your screenshot doesn't give anything helpful? I'm really just swatting at flies, at this point.
Well, this should probably be reported as a bug. It would be better if you did it, because you can provide all the needed details, and answer any questions which developers might have. You can start on this page, to find out what needs to be provided in the report, and it will give you a link to the bug tracker, to make the report.
https://inkscape.org/en/contribute/report-bugs/ After you make the report, please put a link to it in this thread.
If you'd rather not get involved on this level, I don't mind making the report for you. But I might need to contact you at some point, if devs ask for things I can't provide. Or I might try posting to the Inkscape user mailing list as a first step.
Hhmm....out of curiosity, do you have pressure sensitivity in Inkscape? That's the problem we usually hear with tablets. Or is it hard to test without the screen mode?