Radio buttons and checkboxes not displaying

Hi,

I am using a child theme of Gravit, but I get the following problem even with the stock theme.

When I try to embed a Mailchimp form (either using HTML or the Mailchimp plugin) the radio buttons and checkboxes in the form don’t display. They display if I use the default WP theme. I assume I just need to change something in CSS, but I’m not sure what. Please help!

A sample page is at: https://utopiasolutions.pw/join/

Thanks very much!