Hello cavetown.nl,
Thanks for reaching to us and appreciate your patience.
You are using a Custom Single Product layout, which is built with WoodMart WooCommerce builder. Navigate to Layouts > Layout to edit Archive product layouts and you can use the Page Title widget to show that section.
Further, you can read more about the Layout Builder here: https://xtemos.com/docs-topic/woodmart-woocommerce-layout-builder/
Kind Regards