Hi @takayukister!
The Elementor guys make me realize that the problem was with redirects.
I’m running Uptime Theme, but the issue was caused by this plugin:
“Redirection for Contact Form 7”.
I turned it off and then back on again, recreate the redirect action, and now everything works great again. I’ve no idea of why this bug affected only this page but now, after more than a month, we finally solved it.
Thanks for you assistance 🙂