You had incorrect link for your Shop page. It was http://www.domain.net/shop/smoof , I’ve changed it to http://www.domain.net/shop/ in Appearance > Menus. Please check it now.
Also when WooCommerce Multilingual is activated menu can’t be edited in Appearance > Menus. The same problem persists with default WordPress theme too. You have to contact Woocommerce or WPML concerning this issue.