Hi there,
This page was not created with Visual composer, if you try to edit the page in loads in text editor.
Even if the page was created in VC, we could’t recommend the use of the front end editor, which is why it’s disabled by default. If you use the front end editor, you should use the Visual Composer native shortcodes. Due to complexities in how the front end editor works, it’s difficult to get all our shortcodes to work seamlessly with it, without rewriting a good deal of them. As mentioned in our Visual Composer Knowledge Base article, this is not something we’re able to provide support for.
In regards with customizer, it’s loading fine on my end. Please see the attachment.
Thanks.