Script widget works only in admin view but not in Public

Thanks for your answer.

Actually the same embedded script from FUNDA is working on this page https://www.homecrew.nl/rent-out/.
But the issue is with this page. Script isn’t working on this page https://www.homecrew.nl/reviews-recensies-beoordelingen-klanten-engels/. The Editor & method of placing the script is the same. I cleared the cache etc. But still, the issue is there.
I found this on Wpbegginer. Is this okay to add a script in funcations.php for this specific page id?

Adding JavaScript to a Specific WordPress Post Using Code

If you only want to add JavaScript to a single WordPress post, then you will need to add conditional logic to the code.

function wpb_hook_javascript() {
  if (is_single ('5')) { 
    ?>
        <script type="text/javascript">
          // your javscript code goes here
        </script>
    <?php
  }
}
add_action('wp_head', 'wpb_hook_javascript');