I already contacted Visual Composer support:
The plugin directly pulls the content from WP editor. So, when the shortcodes are present, they are pulled as it is. This is irrespective of visual composer and you will see that the problem occurs even when you add a normal shotcode to the content. The fix to this will require the plugin author to add an ability to execute the shortcodes when they are pulled. This will make sure that the shortcodes will be rendered and will no longer display as it is.
Thanks in advance