strange search suggests, post types are not included

Hi,
We don’t get the search results, we expect for our own post types. As you can see in the screenshot, they are all added. I also created new search index. But when typing in, for instance “Holzt” for the magazine article “Holztürme in der Region…”, it doesn’t appear in the auto suggest. Even more strange, the shown suggests have nothing to do with the word, I was searching for.

You can test different articles from here > https://www.schlosser-projekt.de/magazin/
Or for “holzbau” page “serielles sarnieren” also doesn’t show up > https://www.schlosser-projekt.de/holzbau/serielles-sanieren/

I also want to turn off the “did you mean” area. Didn’t find it within the adjustments.

Thx
Florian