Hi Rikard,

we got it fixed over the Weekend. Thank you anyway!

For anyone with the Same Problem – her is what fixed it:

Path: /wp-content/plugins/woocommerce/includes/wc-template-functions.php
unset($classes[4]);
// print_r($classes);

Also, Add this CSS in the customizer :

@media only screen and (min-width: 768px) {

.archive ul.products {
http://width:100% !important;
}
.archive ul.products li {
width: 24%;
height: 500px;
}
.archive ul.products li .thumbnail_container {
height: 200px;
}
}