Product empty page

Do you have an example link? I don’t recognise the ‘group’ terminology.

example:
cat1
subcat1
product1
product2
subcat2
product1

I solved the issue but now I need to make the cat1 page to view the list only of subcat1 and 2 only, without their products

If its nested, it is correct to show children as they are part of the parent category. You can filter/customise https://github.com/woothemes/woocommerce/blob/2be24c3a3333886b279ab14251d0396cef95744b/includes/wc-template-functions.php#L1615-L1622