Reposition the Popup Maker "fixed" popup if there are GF form validation errors.

popup-maker-gravity-forms-reposition-validation-errors.js

/** Reposition the Popup Maker "fixed" popup if there are GF form validation errors. */
jQuery(document).ready(function($) {
	$(document).on('gform_post_render', function(e, formId) {
      		// Look for the GF validation error container when the GF form is rerendered.
  		const validationContainer = jQuery(`#gform_${formId}_validation_container`); // or jQuery(`#gform_${formId} .validation_error`);
		if (validationContainer.length > 0 ) {
        		// Get the Popup Maker popup ID.
			const popupId = parseInt($(validationContainer).closest('.pum').attr('id').split('-').pop());
			// DEBUG
			console.log(`%c[PUM] There are validation errors for Gravity Forms form ${formId} in popup ${popupId}.`, 'color:orangered;font-size:16px');
			let gfPop = PUM.getPopup(popupId);
			// Reposition the popup.
			gfPop.popmake('reposition');
      		} // if
	}); // Listener
}); // jQuery
/** Add this script to the footer area of your page. */

popup-maker-gravity-forms-reposition-validation-errors.php

<?php // Remove this line when pasting into your child theme's functions.php file.

/** PHP Version */

function my_custom_popup_scripts() { ?>
<script type="text/javascript">
/** Reposition the Popup Maker "fixed" popup if there are GF form validation errors. */
jQuery(document).ready(function($) {
	$(document).on('gform_post_render', function(e, formId) {
      		// Look for the GF validation error container when the GF form is rerendered.
  		const validationContainer = jQuery(`#gform_${formId}_validation_container`); // or jQuery(`#gform_${formId} .validation_error`);
		if (validationContainer.length > 0 ) {
        		// Get the Popup Maker popup ID.
			const popupId = parseInt($(validationContainer).closest('.pum').attr('id').split('-').pop());
			// DEBUG
			console.log(`%c[PUM] There are validation errors for Gravity Forms form ${formId} in popup ${popupId}.`, 'color:orangered;font-size:16px');
			let gfPop = PUM.getPopup(popupId);
			// Reposition the popup.
			gfPop.popmake('reposition');
      		} // if
	}); // Listener
}); // jQuery
</script><?php
}
add_action( 'wp_footer', 'my_custom_popup_scripts', 500 );