Hello,
Firstly, you can’t have both page builders activated at the same time on your Site. It is incorrect and can cause conflict on the Site. Only activate that page builder plugin on your Site of which you have imported the Demo with.
So, if you have imported the Demo with Elementor then activate that and if imported with WPBakery then use that on your Site.
Now after doing this please share your Site WP-ADMIN Login details along with the page URL on which you are facing the issue so that we can check further and assist you accordingly.
Best Regards.