miscoloured words in PDF export text font rendering

Some words are rendered with wrong colour (marine blue instead of black) by native page export to PDF file. This effects just only a few complete words in attached PDF file: take a look at the word "Wo" in marked table headings (afterwards added arrows in PDF 'll gide you to the issue).

original webbrowser view (shows black coloured word 'Wo'): JIRA-Bug_PDF-export_original-view.png
result view as PDF (shows marine blue coloured word 'Wo'): JIRA-Bug_PDF-export_font-miscoloured.pdf

Why does it only effects the last three tables but not the first one? The first table was added via WYSIWYG-editor, but the last three ones via markup macro w/o any colour arguments (= default colour) as absolutely like this:

|| Typ || Name || Wo || M-Typ | ... || ... ||
| | | | | | |

adding a table via markup is surely the key to this issue for the 'Wo'-word conspiracy

nearby (2nd bug): the horizontal rows below the text headings are also not rendered in PDF file (they were created via WYSIWYG-editor)