remove_action is not working with some hooks

Hi everyone,

Not sure if my issue is a glitch or I am missing something, here is the details:

I am using a child theme to customize storefront theme, great clean theme btw. That said, when trying to remove actions to remove some of the default sections from homepage it doesn’t work, I am trying to remove the “On Sale” and “Best Sellers” sections, using the following code:

remove_action( 'homepage', 'storefront_on_sale_products',      60 );
remove_action( 'homepage', 'storefront_best_selling_products', 70 );

both are not working, I tried using different priorities, without any luck, is this a bug to report or something needs to be done differently, please assist, thank you.