The theme has no control over the Recaptcha page. If you find you are getting errors, please speak to Shopify Support
If customers are failing to subscribe, check to make sure they are not already subbed under the customer’s tab. For more info, you can check out the Shopify guide on Email Subscriber List. Our theme has no impact here, all it does is forward the info to Shopify admin and Shopify handles the rest. To test any issues and determine if it is a Shopify or a theme error, try subscribing on a fresh install theme or a free one of Shopify themes. The theme does not need to be published to run this test. If it works, please get in touch with us, if not, you can speak to Shopify support for more assistance.