Hi,
I can see that you've configured the menu setting of your filter in order to use the menu item with the alias "resultaat".
However, if I access that menu item directly, without any filters, it doesn't display any products.
If that menu item was configured properly, then it should display all of the products of your shop in one listing when no filters are applied.
So that means there is definitely something wrong with the settings of this menu item and I don't think the problem is something else.
Please provide screenshots of the settings of this menu item.