Whenever you notice that the BeBuilder content is different from what you see in the frontend, like missing backgrounds, fonts or colors set in Advanced tab, it is very likely that your WordPress is misconfigured.
In such case, please go to Settings > General tab in main WordPress dashboard and make sure, the protocol of WordPress Address (URL) and Site Address (URL) are exactly the same as your site. If, your site works under HTTPS protocol but in those fields you have set HTTP, the styles of the BeBuilder won't load.
Due to this miscofiguration, many hosting services returns Blocked loading mixed active content “http://www.xyz.com/wp-content/uploads/betheme/css/post-2.css?ver=1648457683” in JS console.