This page has "noindex, nofollow" set in page > SEO https://hochzeiten.danielbollinger.de/kunden/
I assumed that would also exclude it and its children (which are also set to noindex) from the sitemap, but they are listed: https://hochzeiten.danielbollinger.de/sitemap/
For now I added the /kunden/ directory to the robots.txt but I don't think this is the expected behaviour?