Hi,
Thank you, I was able to log-in. I could not have access to the posts page to check which categories they belong to, but I suspect the results there are not connected to the unchecked categories (probably only assigned to child categories only).
In this case, try the ‘At least one of the selected terms should match’ logic here: https://i.imgur.com/bDrNFwU.png
That will make sure, to restrict the results to the selected categories only, regardless if the rest is excluded, so that only items matching at least one of the selections will be displayed.