Hi,
Thank you, that worked.
I have found and corrected the issue. On the General Options there were 4 post types chosen (including product_variation), however under the grouping only 3 of them. The “missing” results were made up from the product variation goup, which was automatically removed during post process.
Since I think you didn’t want to display variations in the first place, based on the grouping options, I changed that under the general options: https://i.imgur.com/tePoedt.png
Now the most relevant expected results should be visible.