International Shipping problem

Dear WooCommerce support,

I have a problem where I’ve been spending too much time on already. I’m using flatrate shipping in 3 shipping zones. One for the Netherlands, and then two others. In these zones I only use one shipping method. Somehow WooCommerce adds another one on the Cart page saying ‘Flat Rate not assigned (free)’. Where does this come from? I can’t find it anywhere in the backend.

Screenshot: http://ingridrovekamp.nl/wp-content/uploads/2016/07/Schermafdruk-2016-07-14-17.59.12.png

Kind regards,
Koen Roetman

https://wordpress.org/plugins/woocommerce/