mixed content – Enfolds CSS called via http instead of https

Hi,
i got one single URL in my whole website where the CSS from Enfold is called by http instead of https – this creates “mixed content” issue.
1: Why is it only on one page like that?
2: How can i fix that??

Here is an excerpt from the sourcecode:

var avia_framework_globals = avia_framework_globals || {};
    avia_framework_globals.frameworkUrl = 'http://www.maskenzauber.com/wp-content/themes/enfold/framework/';
    avia_framework_globals.installedAt = 'http://www.maskenzauber.com/wp-content/themes/enfold/';
    avia_framework_globals.ajaxurl = 'https://www.maskenzauber.com/wp-admin/admin-ajax.php';
/* ]]> */ 
</script>
 
 <style type='text/css'>#top #wrap_all  .avia-gallery-1 .avia-gallery-thumb a{width:16.6667%;}</style><script type='text/javascript' src='http://www.maskenzauber.com/wp-includes/js/jquery/jquery.js'></script>
<script type='text/javascript' defer='defer' src='http://www.maskenzauber.com/wp-content/themes/enfold/js/avia.js'></script>
<script type='text/javascript' defer='defer' src='http://www.maskenzauber.com/wp-content/themes/enfold/js/shortcodes.js'></script>
<script type='text/javascript' defer='defer' src='http://www.maskenzauber.com/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/audio-player/audio-player.js'></script>
<script type='text/javascript' defer='defer' src='http://www.maskenzauber.com/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/contact/contact.js'></script>
<script type='text/javascript' defer='defer' src='http://www.maskenzauber.com/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/slideshow/slideshow.js'></script>
<script type='text/javascript' defer='defer' src='http://www.maskenzauber.com/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/countdown/countdown.js'></script>
<script type='text/javascript' defer='defer' src='http://www.maskenzauber.com/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/gallery/gallery.js'></script>
<script type='text/javascript' defer='defer' src='http://www.maskenzauber.com/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/gallery_horizontal/gallery_horizontal.js'></script>
<script type='text/javascript' defer='defer' src='http://www.maskenzauber.com/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/headline_rotator/headline_rotator.js'></script>
<script type='text/javascript' defer='defer' src='http://www.maskenzauber.com/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/icongrid/icongrid.js'></script>
<script type='text/javascript' defer='defer' src='http://www.maskenzauber.com/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/iconlist/iconlist.js'></script>
<script type='text/javascript' defer='defer' src='http://www.maskenzauber.com/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/image_hotspots/image_hotspots.js'></script>
<script type='text/javascript' defer='defer' src='http://www.maskenzauber.com/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/magazine/magazine.js'></script>
<script type='text/javascript' defer='defer' src='http://www.maskenzauber.com/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/portfolio/isotope.js'></script>
<script type='text/javascript' defer='defer' src='http://www.maskenzauber.com/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/masonry_entries/masonry_entries.js'></script>
<script type='text/javascript' defer='defer' src='http://www.maskenzauber.com/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/menu/menu.js'></script>
<script type='text/javascript' defer='defer' src='http://www.maskenzauber.com/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/notification/notification.js'></script>
<script type='text/javascript' defer='defer' src='http://www.maskenzauber.com/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/numbers/numbers.js'></script>
<script type='text/javascript' defer='defer' src='http://www.maskenzauber.com/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/portfolio/portfolio.js'></script>
<script type='text/javascript' defer='defer' src='http://www.maskenzauber.com/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/progressbar/progressbar.js'></script>
<script type='text/javascript' defer='defer' src='http://www.maskenzauber.com/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/slideshow/slideshow-video.js'></script>
<script type='text/javascript' defer='defer' src='http://www.maskenzauber.com/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/slideshow_accordion/slideshow_accordion.js'></script>
<script type='text/javascript' defer='defer' src='http://www.maskenzauber.com/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/slideshow_fullscreen/slideshow_fullscreen.js'></script>
<script type='text/javascript' defer='defer' src='http://www.maskenzauber.com/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/tab_section/tab_section.js'></script>
<script type='text/javascript' defer='defer' src='http://www.maskenzauber.com/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/tabs/tabs.js'></script>
<script type='text/javascript' defer='defer' src='http://www.maskenzauber.com/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/testimonials/testimonials.js'></script>
<script type='text/javascript' defer='defer' src='http://www.maskenzauber.com/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/timeline/timeline.js'></script>
<script type='text/javascript' defer='defer' src='http://www.maskenzauber.com/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/toggles/toggles.js'></script>
<script type='text/javascript' defer='defer' src='http://www.maskenzauber.com/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/video/video.js'></script>
<script type='text/javascript' defer='defer' src='http://www.maskenzauber.com/wp-content/themes/enfold/js/aviapopup/jquery.magnific-popup.min.js'></script>
<script type='text/javascript' defer='defer' src='http://www.maskenzauber.com/wp-content/themes/enfold/js/avia-snippet-lightbox.js'></script>
<script type='text/javascript' defer='defer' src='http://www.maskenzauber.com/wp-content/themes/enfold/js/avia-snippet-megamenu.js'></script>
<script type='text/javascript' defer='defer' src='http://www.maskenzauber.com/wp-content/themes/enfold/js/avia-snippet-sticky-header.js'></script>
<script type='text/javascript' defer='defer' src='http://www.maskenzauber.com/wp-content/themes/enfold/js/avia-snippet-widget.js'></script>
<script type='text/javascript'>
/* <![CDATA[ */