As I see you have very old Visual Composer version. Please update it and check if it fixes the issue. To update the plugin you need download the theme archive at http://themeforest.net/item/legenda-responsive-multipurpose-wordpress-theme/5888906 where we’ve recently included the updated versions of plugins VC and Revolution Slider. After you unzip the archive you’ll find the plugins in legenda/framework/plugins directory. Upload the new version via FTP and remove the old one.
We recommend you to create a ticket at http://support.8theme.com/ regarding this issue and our specialists will look into it more deeply.
Please include your login details to FTP and admin panel in the ticket.