makemigrations generates new migration when nothing has changed

Any idea why makemigrations would fail to recognise that a migration has already been generated?

makemigrations.py is a script which calls makemigrations with appropriate django settings. If I run this once, it will generate the initial migration, but every time I run it subsequently, it will regenerate a migration even though nothing has changed in the model. This is with django 1.10.3 and postgres. The field sk that is constantly regenerated is a foreign key relation to an unmanaged database, but I have referred to this in a different app with no bother.

I am using django 1.10.3.

I found a post in this group that had a similar issue with instantiating a class in the model that was missing an implementation for __eq__ but that doesn't apply in this case as I don't instantiate any class in the model file.

Is there any common mistake that leads to this outcome?

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user@testenv:~/eit/testproj$ ./makemigrations.py 

Migrations for 'sk':

  testproj/sk/migrations/0001_initial.py:

    - Create model SKM

user@testenv:~/eit/testproj$ ./makemigrations.py 

Migrations for 'sk':

  testproj/sk/migrations/0002_auto_20161130_1643.py:

    - Alter field s on skm

user@testenv:~/eit/testproj$ 

user@testenv:~/eit/testproj$ ./makemigrations.py 

Migrations for 'sk':

  testproj/sk/migrations/0003_auto_20161130_1643.py:

    - Alter field s on skm

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