Sort by does not work correctly with search

https://el4.thembaydev.com/fana/?product_cat=&s=te&post_type=product

This is my search page, it shows 13 results. But after sort by any item, it will display full result and not 13

=> https://el4.thembaydev.com/fana/?swoof=1&post_type=product&orderby=popularity

Where do I need to configure to fix that?

The page I need help with: [log in to see the link]