Hey Janno
I would say this is a theme specific issue and not a plugin issue. I generally do not provide support for customising your theme template files – as these are more to do with your theme than the plugin – for example you can use this template anywhere in your theme (that is not the product archive) and I’m sure you would find similar results/problems.
However, that being said, the first thing to do with this kind of problem is check what the differences are between these two pages.
So I had a quick look at the source of the both the pages – although very similar there is one big difference.
If you take a look at the opening body tag you will notice the woocommerce page formatted in a grid has the class woocommerce-page and the results page does not.
I added it via the dom inspector to http://vanka.magicservices.nl/producten and the grid works 🙂
So there are two approaches to fixing this – the first – edit your css rules so the grid classes are also applied to the Search & Filter results page…
or
Add this class to the body tag on your results page 🙂 This option is easier and only requires copying and pasting some code into functions.php:
add_filter('body_class','add_body_class_to_search_filter');
function add_body_class_to_search_filter($classes) {
global $sf_form_data;
if ($sf_form_data->is_valid_form())
{
$classes[] = "woocommerce-page";
}
// return the $classes array
return $classes;
}
Hope that helps!
.
