Hi,
The problem you described was about the display limit not working on your products listings when filtered.
But if I go to your link /spares?limitstart=&filter_Sortbyprice_1=none&filter_Brand_3=filter_Brand_3&filter_Search_4=red that you provided, and change the "display" dropdown at the bottom to "all" instead of "18", ir correctly displays all the products on the page:
take.ms/ctlMn
If I remember correctly, that wasn't the case before on your link.
Now, in your new message, you're talking about the "first shop-page". I don't know what page you're talking about. You say that it is configured to display 3*7 products, but I only see listings with 18 products per page on your website.
And you say that the problem is that the pagination doesn't display on that page. So I would have to look at it in order to understand the situation because all the products listings I see on your website do have a pagination.
Could you provide a link to the page you're talking about now ?