Please 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.
Otherwise, if the issue still exists then keep the 3rd party plugins deactivated and share the WP admin login details of your site so I will check and give you a possible solution.
I’m so happy to hear you are pleased with the Theme and Support. XTEMOS strives to deliver the best customer experience, and it makes our day to hear we have accomplished that.
We count ourselves lucky to have you as a customer. You can always reach us at any time. We are always here to help you.