WooCommerce keeps sending default template, not the custom ones

Hello there,

first of all, nice plug-in! Easy to use and top customization level. But… WooCommerce keeps sending default email templates to my customers! When i try to send a test email everything goes well, but wen i try to make a test order as a customer, woocommerce sends the default templates. I bought the Premium version hoping this would solve the problem, but nothing changed. Please help me! 🙂

Thank you in advance