Error wp bakery

I need help with my page. I have template on www.remarpro.com.
I was always able to change text in wpbakery editor but suddendly it didnt allow me. Then I read that I need to update to new version and it didnt work either. I also tried to download plugin Classic Editor, all of people said it could work but it doesnt.
I can send pictures of form that it should be and form in which is page now.
I am hoping you can help me with my problem.
Thank you

The page I need help with: [log in to see the link]