Weird problem converting Markdown to PDF

Converting an .md file to PDF produces a glitch that looks like a page was printed twice on the same piece of paper or something (see attached image). This only happens with headlines or bold text, not plain text. Any ideas?

Is it maybe possible to edit Devonthink’s stylesheet for Markdown to PDF conversion?

(Edit: I know it’s possible to point Devonthink to another stylesheet in Preferences, however I quite like Devonthink’s template, I just wonder if editing it might get rid of the weird ‘double letters’ glitch…)

Which version of macOS do you use? And do you use any custom stylesheets?

Are you printing to PDF or using Data > Convert?

10.14.6 Mojave
no custom style sheets, I just changed the fonts for text etc. in DT’s preferences

Could you please send an example Markdown document to cgrunenberg - at - devon-technologies.com? Thanks!

both, same result; DT’s Markdown preview (next to the editable text) is OK though…

done

The issue was caused by the used font and has been fixed by changing the fonts in the preferences.