I have added in addition WooCommerce Product Categories Widget, WooCommerce Product Price Filter and WooCommerce Product Recently Viewed widgets to shop sidebar but they aren’t showing only Categories are showing.
Site URL: hidden Theme version: v2.4 WooCommerce version: 2.4.7
Price filter widget isn’t shown because you have similar price for all products – $750, that’s why there is nothing to filter.
If you view several single product pages, WooCommerce Product Recently Viewed widget will also work after that and products will be shown in sidebar. Please check it.