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 change the content as you wish.
Grouped product is consists of Single Product only and it is out of WoodMart controls. You may contact support of WooCommerce, maybe they will be able to advise some workaround – https://wordpress.org/support/plugin/woocommerce/