My best guess is that your issue might probably caused by some conflicting third party plugin or some extra code snippet as we don’t encounter this issue with our demos.
Could you deactivate all plugins that have not been installed with your theme during its setup and all existing custom PHP code snippets please? And then, could you confirm me that the issue is still persisting please?
After taking a look at your site, I noticed that it is currently using an outdated version of the theme. Could you please try to update your theme to the latest version to see if it fixes the issue ?
To update your theme, you can download and install the Envato Market plugin (https://envato.com/market-plugin/) on your WordPress site.
Once the plugin is installed and activated, go to “Envato Market” in your admin menu and follow the instructions under “Activate Envato API Connection”.
When this is done, you will see your purchased themes under the “Themes” tab and you should be able to update your theme from there by clicking the “Update available” button.
Please also make sure that all recommended plugins are up-to-date. Finally, you could also consider clearing all activated caching system as well as your browser cache before investigating any further.
We’re waiting for your feedback. 🙂