Hello,
Right now I can see a mess on your site, it looks like demo content was installed incorrectly or was ruined by something.
It is recommended to run import on a fresh WordPress installation. For this you can use 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 access here. We will help you with the import of https://xstore.8theme.com/elementor/demos/lifestyle-blog/ demo , and will check the problem with customization.
About wp-admin access: Create an account via Dashboard (Users > Add new) with administrator role http://prntscr.com/s3rc9m > provide us with username and password via the Private Content area http://prntscr.com/s5mao7 You can use any email for it.
Regards