I'm not able to log-in to the back-end, it requires .htaccess password, but I think I see the problem via FTP.
In the search query I see lots of pages and page parents excluded (Advanced Options -> Exclude results panel). For example the “Österreich” page has the ID 3841 and it looks like it's excluded.
Please check the Advanced Options -> Exclude results panel for the page and page parent exclusions.Best,
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