Modular blueprints only work sometimes

Hello! I'm creating a theme for a one-page site, and using a modular approach. I've been able to successfully create blueprints for two of the modules, but the blueprints are not working for the other 4. All the modules are set up exactly the same, and I've been trying to use the blueprint examples from the documentation (https://learn.getgrav.org/17/forms/blueprints/example-page-blueprint), which worked for the first two pages.

I don't understand why it works for two of them but not the rest. I'm at my wit's end. Any help would be appreciated.

The yaml:

title: Gallery
'@extends':
    type: default
    context: blueprints://pages

form:
  fields:
    tabs:
      type: tabs
      active: 1

      fields:
        gallery:
          type: tab
          title: Gallery

          fields:
            header.an_example_text_field:
              type: text
              label: Add a number
              default: 5
              validate:
                required: true
                type: int

            header.an_example_select_box:
              type: select
              label: Select one of the following
              default: one
              options:
                one: One
                two: Two
                three: Three

File structure:

Good point on the vagueness... the changes on the blueprints were not reflected on the admin page.

But clearing the cache worked! Been spinning my wheels for a couple of hours. Thank you so much!

@gcasalett, Add $ bin/grav cache to your toolbelt and use it whenever changes do not show up.