Hello,
Thank you very much for choosing our theme and for contacting us.
The problem may be caused by 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.
In case your site URL is HTTPS and the same is in the Settings > General, contact the host support and ask to disable security mode. If none works, please provide your site admin access. You can insert the credentials into the Private content under the message area.
Best Regards