Please make sure that all 3rd party plugins are disabled before the import. Demo content can be imported incorrectly in case a lot of 3rd party plugins were activated on the site before the import. In this case, can you please share your site super WP-ADMIN Login URL and Credentials in the below-listed format in the private content area of this topic on which you are facing the issue so that we’ll check and assist you accordingly?
Also, let us know which demo you want to import and with which page builder (wp bakery, Elementor) so that we will help you out.
It is recommended to run import on a fresh WordPress installation. For this you can use the WordPress Database Reset plugin https://wordpress.org/plugins/wordpress-database-reset/ The plugin can be used to remove all the existing content and install a new version from scratch.
Please do the reset and reply with temporary wp-admin and FTP access here. We will help you with the import.
