Recalculating returns always the first payment method

Hello,

We are using this plugin but it doesn’t work fully properly. Fees are added to the price (great!) but the payment method always returns to the first one when the cart is recalculated.

Do you have any clue about this issue?

Thanks.

http://wordpress.org/plugins/woocommerce-add-extra-charges-option-to-payment-gateways/