Hi everyone @mb.io
Mostly a suggestion than a support topic, you should add the form id to the rendered frontend form
in wp-content/plugins/meta-box-aio/vendor/meta-box/mb-frontend-submission/src/Form.php
Line 59
Change
echo '<form class="rwmb-form" method="post" enctype="multipart/form-data" encoding="multipart/form-data">';
To
echo '<form class="rwmb-form" id="'.$this->config['id'].'" method="post" enctype="multipart/form-data" encoding="multipart/form-data">';
It would be easier to, for example, target a specific form when you have multiple form on the same page, with a script or a style.
Maybe there's a better way i am not aware of, havn't found this in docs (?).
Thanks again for your great works.
KL