Hi @andreij
I’ve just tested it on my installation but failed to reproduce the issue. Could you please share the JSON export file of your field group so I can test it out?
Also, could you please try to reproduce the issue on one of the WordPress’ stock themes (like Twenty Sixteen) with other plugins deactivated? If it disappears, then you can activate the theme and plugins one by one to see which one causes the issue.
Thanks 🙂
