Hi Avantage
I tried to reproduce that issue in a clean ATUM installation but it's working fine for me.
As you are working on dev site and there is no risk of breaking something, please deactivate all the plugins except ATUM and WooCommerce, next switch the theme to Storefront and check if the problem is still there.
If the problem is not fixed, please open a private ticket here and provide us admin credentials to your site to take a look.
Best Regards,
Andres