Hi!
Thank you for the details!
I am assuming, that some of those results are probably categories/terms and not only post types. I suspect you only want to show post types as results, since filtering taxonomy terms by taxonomy terms is obviously not possible.
On the General Options -> Sources 2 panel, make sure you don’t have any taxonomies selected to returned: https://i.imgur.com/hgOdbb5.png
Another possibility is, that there might be posts/pages in the results, which may not belong to any of the filtered categories, and by default, the plugin will include those as potential results. To exclude them, turn OFF this option.
I believe these will very likely do it for you.
If you want to, you can read more about these features here:
– Posts with missing terms & filters
– Taxonomy term logic