random courses when searching for course

try to produce: "robert ankenmann"

No files or tests are mentioned in the issue. Reproduce the behavior by searching for "robert ankenmann" and confirm that results appear random. Then locate the course search flow from the query input through the handler/service that builds and orders results, and inspect any surrounding search-related tests. Mark the issue as done when that input consistently returns a stable, correct set/order of courses.

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