Not receiving custom contact form messages in BigCommerce

We just realized yesterday that we hadn't been receiving messages from our contact form on our contact page since the middle of April... Everything looks as if we would receive it (form resets after submit button is clicked and a success message displays), but we never receive the message on our end.

We wanted a 2 column layout, so we copied the html markup that's generated from the default form on BigCommerce, enabled recaptcha, and added JS for form validation.

Here's the first line of the form, which seems like it would work according to BigCommerce Docs:

<form data-contact-form class="form" id="contact-form" action="/pages.php?action=sendContactForm" method="post">

Here's the URL to the page:

www.thedashcamstore.com/contact-us