Hello,
That issue is usually caused by a cache or incorrect HTTP and HTTPS configuration: https://domain.com is the actual site URL, however, http://domain.com is used in Dashboard > Settings > General. In this case, it is necessary to configure URLs correctly or clear the cache and check again.
If the issue remains, deactivate all the 3rd party plugins and activate only theme-required plugins on the site, and then check the issue. I am sure your issue will be solved. Then Activate the 3rd party plugins one by one and check which plugin is creating the issue for you.
If the issue still remains, share the WP login details of your site so I will further check on your site and give you a possible solution.
Best Regards,
.
