Hello,
The errors shown in the console are (probably) not related to the drop-down issue, as far as we can tell.
But again “if the dropdown works, if you are a user, then the issue is presumably with .js when you are in the Admin panel. (The same dropdown system is used for users and admins)”
The widget has a drop-down issue when one is creating a page using Elementor (in your case the Visual Composer).
Please try the usual way of deploying the widget in a footer through the Admin panel, and let us know if the issue has been solved.
The preferred way of implementing the widget on a static page is using a shortcode.
On both ways please read the widget’s FAQ