I have installed reCAPTCHA for woocommerce by Thirteen Web Solutions. When enabling the plugin for my checkout page, inputting the Credit Card info it does a little refresh and then the Credit Card info gets deleted and it becomes a continuous loop of inputting the info and getting deleted when moving forward.

I have another reCAPTCHA for contact form 7 that works fine, the checkout page has its own Key and Secret different from the one for the contact forms.

When the checkout reCAPTCHA plugin is deactivated it works fine. Ive tested it with older PHP and it still did not work when installed.