Hello,
I visited the URL you provided. It seems that you are not configuring the popup button in the right way.
Please follow the following steps:
1) To create a pop up button first you need to Create an HTML Block from Theme Settings >> HTML Block.
Which will contain the content that will be shown when the button is clicked.
Screenshot for Clarification: https://www.screencast.com/t/PrBUgPuB
2) Then You will need to create another HTML Block containing the Popup Module of the Wp-Bakery Page Builder.
And inside the popup module you need to insert the shortcode of the HTML block you created as content using Raw HTML Module.
Screenshot for Clarification: https://www.screencast.com/t/7cASduqLrx
3) Then you can use the HTML block id to display it anywhere you want.
Best Regards.