When i choose to export a page in Confluence via ... -> Export -> Export to PDF the output is different (and not good) since my last export.

Left the page exported on April 3rd, right the page exported today (May 12th).
Three things go wrong (see red bullets):
- There is no bookmark anymore, i merged this PDF to another one and there must be bookmarks for the overview
- The is a link-image after each header, which won't work (and is is not desired)
- The font changed while I haven't edited the page
How can i change this back to "normal" of is this a bug?