When you export a KB article to PDF the line breaks are missing and looks very different to the article itself.

1. Navigate to Knowledge Base > Published > KB0000022 (as a good example)
2. Right click on the Knowledge header and select Export > PDF (Portrait)

Notice that the content of the KB looks different to the exported KB article

The platform also provides the "Printer friendly version" option that can be used on any page including forms, that would generate the HTML to PDF export with formatted content.