Yes i saw. When i have filtered through- “ordina per novita” first time it was showing 4 product but after filtered with other categories when i have filtered again with “ordina per novita” it was showing all 7 product. It is a WooCommerce Shop product filter. So it is coming from there. If you want us to take look on this then please provide your login details by using this form: http://wedevs.com/provide-login-details/. I will have a look what is going wrong.