Elasticsearch: nextcloud doesn't show all search results

Hello everyone,
I have elasticsearch 7.17.10 running on a docker container. I installed the apps “Full text search”, “Full text search - Elastic Platform” and “Full text search - files” on the netxcloud.
Here are my settings:

php occ fulltextsearch:index runs without errors.

When I search for Schm I get 76 hits, but only one is displayed on the first page.

If I restrict the search further, I only get 19 hits, but 4 are now displayed.

If I narrow the search further, I get this:

Is there such a thing as invisible search results? How do I get all search results to be displayed?

Thank you in advance for thinking along.