Hello,
I’ve checked this issue with standard Sale products widget and official WooCommerce theme – Storefront, there is the same situation http://prntscr.com/esqs80 http://prntscr.com/esqs44. We’ll be able to help you only in case problem appears with our theme only and works fine with official WC theme Storefront.
Please note, compatibility of our theme with WooCommerce 3.0 will be added in a new theme update. Don’t update WooCommerce plugin before theme update.
Regards,
Rose Tyler.