Posts wrongly displayed in admin section after switching from Avada theme

I have recently started using Blocksy with all my new websites and I am extremely happy about my experience with it. So I have also been trying to migrate my old website that I made with Avada to the Blocksy ecosystem. However I met with quite the annoying bug. I would ask to the Avada people for help but now that my support license is expired, customer support is behind an hefty paywall that I not intend to pay as I am leaving their product anyway.

The migration went mostly fine (until now), but when I go to the admin dashboard and go to posts (like blog posts) they are all displayed in a bizarre way making my user experience quite the nightmare.

You can see how messed up it looks here.

Is this possible to solve without nuking the website and starting from scratch? I will happily avoid that if I can.