I am having the same problem with this. I tried styling the recaptcha and submit buttons every which way to make this work. I finally added another submit field as a workaround that the recaptcha covers.
https://samudralaspinepasadena.com/contact-us/
Here is my code for the form that includes the workaround. Without the workaround, the recaptcha completely covers the submit button.
<p>Your Name (required)
[text* your-name] </p>
<p>Your Email (required)
[email* your-email] </p>
<p>Subject
[text your-subject] </p>
<p>Your Message
[textarea your-message] </p>
<p>[recaptcha]</p>
<p>[submit “I am not a robot”]</p>
<p>[submit “Send”]</p>
