There's a known bug on Leohtian based WordPress sites where CSS doesn't load properly.

The fix is already applied to the Nightly branch but as there might not be a new release of Jomres for a while, I'll tell you here how to apply the fix until the next release goes live.

You can find the change here : https://github.com/WoollyinWalesIT/jomres/commit/0bb1effee8e0e057d2b86f8a2bd76238e0144fb6

You shouldn't, however, change the file in /jomres/libraries/jomres/cms_specific/wordpress/cms_plugin/includes/jomres.php because that's just a holding location for the CMS plugin. That file is copied by Jomres to another dir during update.

Instead, you need to edit /wp-content/plugins/jomres/includes/jomres.php and make the changes there. Next time there's a Jomres release your changes will be overwritten by the same fix, so you won't need to do it again.