Can’t publish the page – Server Error (400 Bad Request)

Hello, we have an ongoing issue with Elementor editor not saving content on a specific page. The page in itself is basically a Nested Tabs widget, with only three tabs. Each tab has a container for each company we are presenting, containing an image, title, description, and button link – nothing more.

So, I’ve created first two tabs just fine, but when I tried to create the “All” tab which would contain all the companies from both tabs – we get the Server Error (400 Bad Request) error and the page simply can’t be published. I read your guide on this issue, and let me just clarify what we tried to do:

• Deactivated all kinds of different plugins, including caching and firewall solutions
• Moved website to another, more powerful server
• Divided each tab into it’s own separate template

Nothing works! And since I’ve tried this on two entirely different server environments and got the same error, that means that the issue is with the plugin itself, not with the server. How do we fix this error and finally publish the page? The HTML elements in those containers are very basic, as I stated above, so what is the problem with saving this page/template?

https://share.cleanshot.com/lGshPxTh

https://share.cleanshot.com/XZRK4L1z

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