Thanks for writing in!
I checked your site and can confirm the issue.
The issue might be due to several reasons. As I don 't have access to your admin can't confirm what exactly the issue is.
I would suggest you few points to check if that helps you to fix the issue.
Ensure everything is up to date according to our version compatibility list at https://theme.co/apex/forum/t/troubleshooting-version-compatibility/195. Please follow the best practices when updating your theme and plugins. See https://theme.co/apex/forum/t/setup-updating-your-themes-and-plugins/62 for more details.
Custom code syntax error. If you have a child theme, please enable the child theme and check if the issue still exists. If you have entered any custom JS, HTML or CSS into their respective editors. Please review the code for any syntax errors. A mis-placed semi-colon or a missing bracket will cause the issue you're seeing.
3.Test for a plugin conflict. You can do this by deactivating all third party plugins, and seeing if the problem remains. If it's fixed, you'll know a plugin caused the problem, and you can narrow down which one by reactivating them one at a time.
If you could please try the above and if you still have the issue we'd be more than happy to assist.
In case the issue persists, would you mind providing us with login credentials so we can take a closer look? Please provide following information:
Set it as Secure Note
* Link to your site
* WordPress Admin username / password
All the best!