Did you write custom code to change products page layout?
Could you, please, check if the problem persists with our theme only or with default WooCommerce theme too? Go to Appearance > Themes > install and activate official WooCommerce theme Storefront. Let me know result and provide wp-admin access in Private Content.
It’s not possible to move products below the categories with the existing structure of the page. By default WooCommerce displays categories and products at the 1 block. If you want to implement this then you need to make changes in template files and move categories and products into 2 separate blocks.