Transferred Domain, now getting errors on very specific pages

“Updating failed. The response is not a valid JSON response.”

I transferred my domain from GoDaddy to NameHero. I had to download an old backup and upload the content fresh. I now have an error message stating the above when I try to update this page. There’s two other pages that are identical to it, and they have the same issues. I can’t seem to isolate the issue. I was going to try to just redo the page and switch the url around, but when I make a new page and copy it over I get the same error message. It almost seems to be a problem with adsense or WP forms. Except for the fact that I have the same ads and same forms on other pages. So why would it only be affecting these pages?

For the record, I have googled this and have reset my permalinks. Every other solution I saw was too invasive. Those who usually see this message see it across all their pages. I just have it for these three. What gives?

It’s not really a big deal, but I have also noticed that when I visit my website, the top admin bar looks normal. But when I go into /wp-admin, half of my plug in headers are missing. Not sure what that’s about. Thoughts?

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