Why is "Hello World!" alternating with Django welcome page after following tutorial?

I just followed this tutorial to create the simplest possible Django application:

https://aws.amazon.com/getting-started/hands-on/deploy-python-application/

I used campaign instead of tutorial and app instead of hello_world because I intend to transform the tutorial into a simple production application.

When I load the app in my browser, I get either "Hello, World!" (the expected result) or the Django welcome page ("The install worked successfully! Congratulations! You are seeing this page because DEBUG=True is in your settings file and you have not configured any URLs"). The two alternate. It's not random -- I always get one and then the other when I reload the page.

campaign/app/urls.py contains:

from django.urls import path

from . import views

urlpatterns = [

     path('', views.index, name='index'),

]

campaign/campaign/urls.py contains:

from django.contrib import admin

from django.urls import include, path

urlpatterns = [

    path('', include('app.urls')),

    path('admin/', admin.site.urls),

]

I don't get how it works as expected every OTHER time. Obviously I can't move on until I get this fixed.

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