I reached out to Formidable and they are saying that the issue is coming from Xtheme pro.
"If you switch your theme to the default WordPress theme that I installed, and also disable the code snippet you added (to remove Bootstrap script) and check this page https://careers.greatnhrestaurants.com/careerformidable/. Your date field is correctly rendered in the modal pop-up.
That is very strange. I’ve tested the Bootstrap Modal add-on on my dev site and I’m not seeing the error that is showing in your developer console. There must be something unique to your site that is interfering with Formidable and causing the issue.
You can get in touch with the theme developers so they can take a look at the conflicting script for you."
NOTE; This was added to help but it’s something wrong with Xthem Pro that is conflicting scripts…
add_action(‘wp_footer’, ‘remove_bootstrap_js’, 1 );
wp_dequeue_script( ‘bootstrap’ );
wp_dequeue_style( ‘bootstrap’ );