Remixer site import from DreamHost

I moved this site, that was built with Remixer on DreamHost, to WordPress in order to be able to secure the site, which I have successfully done. Although the site still looks and works almost as before, when I try to edit it, I encounter several blocks with the messages, “This block contains unexpected or invalid content.” and “This block has encountered an error and cannot be previewed.” but a few of the blocks appear “normal” and editable.

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