In reference to posts: Gravity Forms doesn't work inside Elementor Popup and Gravity forms not working in Elementor Popup
Issue: Form validation will not work when loaded from an Elementor Popup. You’ll get the error message (‘There was a problem with your submission. Please review the fields below’). When you click Submit for the 2nd time, it will work.
Solution: Copy the following to an HTML Code block on the popup. Replace the [1 with the form ID, so it was form ID = 5, then it would be [5,1]
<script>
jQuery(document).on('elementor/popup/show', function() {jQuery(document).trigger('gform_post_render', [1,1]); });
</script>