Thanks for the topic. The advanced carousel element relates to Ultimate VC addons plugin functionality. Tell me how it works with a default theme? Or you have problems only when our theme is activated. Because we are theme support and we can help you with issues related strictly to our theme.
Could you please provide temporary wp-admin access in Private Content so we can take a closer look?
Also, make sure that you use latest versions of required plugins – https://www.8theme.com/download-plugins/