Thanks for updating in! I have logged in to your site and continue to investigate the issue. I was able to edit one of your page. Please check out my screenshot:
I also check your themes and I could not find any Pro Child theme. So I went ahead and install the child theme, activated it and tested another page again. I still did not encounter any issue.
I went on again to enabled the Ubermenu. I tested again to edit the pages in the editor and I still do not encounter any issues. The problem may have been resolved already.
Please clear your browser cache or use private browser mode and test your site again.
Please let us know how it goes.