If you have troubles since the update to WordPress 4.5 please read this post before opening a new thread.
You can use a plugin like: http://wordpress.org/extend/plugins/post-types-order/ to sort the products manually. By default they’re sorted based on the title. Afaik WooCommerce also provides a sorting feature (Products > Products > Sort Products) but I think the Post types order plugin works a bit better. If you use the default WooComerce sort feature make sure that the default sorting option is used/activate (WooCommerce > Settings > Catalog > “Default product sorting”).
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