Why does Order matter in Kwarg parameters in MagicMock asserts?

I have a test where I am mocking a filter call on a manager. the assert looks like this:

filter_mock.assert_called_once_with(type_id__in=[3, 4, 5, 6], finance=mock_finance, parent_transaction__date_posted=tran_date_posted)

and the code being tested looks like this:

agregates = Balance.objects.filter(
            finance=self.finance,type_id__in=self.balance_types,
            parent_transaction__date_posted__lte=self.transaction_date_posted
        )

I thought that since these are kwargs, order shouldn't matter, but the test is failing, even though the values for each pair DO match. below is the error I am seeing:

AssertionError: Expected call: filter(type_id__in=[3, 4, 5, 6], parent_transaction__date_posted=datetime.datetime(2015, 5, 29, 16, 22, 59, 532772), finance=) Actual call: filter(type_id__in=[3, 4, 5, 6], finance=, parent_transaction__date_posted__lte=datetime.datetime(2015, 5, 29, 16, 22, 59, 532772))

what the heck is going on? kwarg order should not matter, and even if I do order to match what the test is asserting, the test still fails.