Subscription - Recurring amount stays at $0.00
Probably the problem is related to the payment method that you are using in the shop.
How explained in the landing page of plugin and in the documentation,
PayPal standard and YITH WooCommerce Stripe (premium version) are the only payment methods that allows you to automate payment of subscription periodic fees.
You are using different payment methods for this reason the recurring amount is 0.
Change the your payment method, so you can sell your subscription.