SSR with NextJS not working for some pages

I have just deployed a nextjs application with Vercel. Everything works fine but I’m having some issues with SSR. I have two pages, the index / homepage and one registration page.

When I check the source code for the registration page I can see all the content (SSR working fine) but when I check for the homepage, it looks like it is being rendered by the client (can’t see the content).

Does anyone know what may be causing this behavior?