For example:

We have hundreds of these, and they don't seem to group correctly either. They do group correctly, as shown in the screenshot below. It's just confusing because they all start with the same string.
In this specific case the root cause seems to be WSGI returning a 403 response because someone made a request to an endpoint that requires authorization without being logged in...
The other confounding factor here is that the view in question is a Django Rest Framework APIView.
I had a little bit of trouble tracking this down because it doesn't seem to happen when using Django's runserver but it does underneath uwsgi. Still tracking down what causes this to happen in production but locally...