Can you please add temporary back-end and FTP access? By only looking at the front-end, I can’t see which items are excluded, and which ones should not display. Thank you!
The search on the test search page is the search ID = 1 (Header Search), while you have set the exclusions for search ID = 2 (Suchergebnisseite).
If you either change the shortcoedes, or set the exclusions for the Header Search, it should work fine.