When I look at the source code of the page and click on the stylesheets for the module, I can see that the file /cache/mod_trombinoscopecontacts/style_94.css on the server does not have access permissions.
The files in the /cache should have access permission in order to be usable.
Simplify Your Web is not affiliated with or endorsed by The Joomla! Project™ or Open Source Matters. The Joomla!® name and logo is used under a limited license granted by Open Source Matters the trademark holder in the United States and other countries.