Hi,
Thank you very much for all the details, I was able to find the issue – it was only a configuration related problem.
On both search instances, the keyword logic was set to “OR” – meaning that any of the entered keywords could match even partially. So the results shown contained either of those words.
I suspect you want a more strict logic, so I have changed it to “AND with exact keyword matches”: https://i.imgur.com/nNdYHo5.png
Now you should see much different search results, with more strict matching.
