I've been using the same configuration for a couple of sites over the past year or two and i've never had this happen before.

Consider this header:

title: title text
description: Description text
canonical: https://website.com
contentful:
content_type: '*'
include: 10
layout: base.html

I put in my fields as such : {{ data.contentTypes.homepage.[0].fields.heroTitle }}
and then I build the project, and everything is great.

I add a new content type to Contentful and add content to it. When I published it, the fields for the other page vanish except for two random fields that change everytime I rebuild.

Perhaps I am hitting some sort of API limit?