Hi,
Thanks for the details, it helps a lot!
There was indeed an issue with the exact matching, for some reason it didn’t activate, but luckily there is a temporary fix for it until we test this further. I have enabled an exact match filter as active and hidden it via custom CSS. Now exact matching will be okay.
Then I also noticed that the posts per page is different for this kind of results page, as it generates pagination via javascript. I have manually set the results count to 5000 per page, now all results should be displayed.