Can't modify immutable headers seen while trying to navigate into different paths of the website

So what I am basically doing is we have a react application and a webflow app. We are trying to keep the home page and some of the paths like /blog, /pricing from the webflow. The webflow application is working fine on the home page or on / path but issue occurs when I try to navigate to other paths of the webflow application. The application works fine with react application and path routing also works fine, But issue is seen with webflow application. I though it was the issue with webflow so I have the paid plan and the custom domain navigated to my domain.

But still immutable headers is seen. When I removed this message then 404 cloudflare page is seen when I try to navigate into it,
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