square box instead of phone symbol on Chrome

Hey Tilman,
You have a CORS error:

Access to font at 'https://auto-wulf.de/wp-content/themes/enfold/config-templatebuilder/avia-template-builder/assets/fonts/entypo-fontello/entypo-fontello.woff' from origin 'https://www.auto-wulf.de' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. 

This is a www vs non-www mismatch issue. Even though it feels like the “same domain,” browsers treat auto-wulf.de and http://www.auto-wulf.de as two completely different origins.
Option 1 — Add CORS headers in .htaccess (easiest for Apache/WordPress)
Add this to your .htaccess file in the root of your site:

<FilesMatch "\.(woff|woff2|ttf|otf|eot|svg)$">
    Header set Access-Control-Allow-Origin "*"
</FilesMatch>

Option 2 — Redirect all non-www to www (recommended anyway)
This fixes the root cause by making sure all assets are always loaded from the same origin. Add to .htaccess:

RewriteEngine On
RewriteCond %{HTTP_HOST} ^auto-wulf\.de [NC]
RewriteRule ^(.*)$ https://www.auto-wulf.de/$1 [R=301,L] 

You can edit .htaccess via FTP/SFTP or through your hosting control panel’s file manager.

Best regards,
Mike

Hi,

Great, I’m glad that you found the problem. We’ll close this thread for now then, please open a new thread if you should have any further questions or problems.

Best regards,
Rikard