Hello,
Please make sure that you use the latest version of Visual Composer and Ultimate Addons for Visual Composer https://www.8theme.com/download-plugins/page/2/
Also, try to activate Storefront theme – official WC theme and check if you have this issue with our theme only or even with official theme too. In case, problem appears only with our theme try to disable 3-rd party plugins (means the plugins that are not included in the theme package are not in the list of required plugins) and check your issues.
Regards,
Rose Tyler.