I never get a clear answer when I search for a fix for this issue
Any chance you are exporting to PDF and viewing this in Adobe Acrobat? If so, the enhance thin lines setting could be on, and that makes thin lines look odd like you have above. If that's the cause, opening the PDF in a browser, like Chrome, will show the correct result. You can turn off the thin lines setting in Adobe as well, learn more at this help page, in the rendering section.
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