Hi Lior,
Thank you for writing in, I see that you’re using an older version of PRO, please update to the latest version to make sure it is not an incompatibility issue.
Updating Your Themes and Plugins
And update your Wordpress to the latest version as well (if it is not updated yet), latest version of Wordpress is 5.3.2
Updating WordPress
Remember to clear all your caching features (plugin, server-side, CDN, and browser’s cache) after updating so that the code from the latest release is always in use. This will help you to avoid any potential errors.
After the update and if the issue persists, please recall all your custom CSS on Theme Options > CSS area, and Element CSS.
You can use CSSLINT for checking your custom CSS.
Let us know how it goes,
Cheers!