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> In this example, I'm sort by item number 1, which is a list, and its
> first value is an int.
? You're sorting by the values of the dict d, and those values have the form [int, int, dict]; so when the two ints match (e.g., in your data, there are two values of the form [64, 124, {...}]) there's a dictionary comparison.
Did you mean to do:
 sorted(d.values(), key=operator.itemgetter(1), reverse=1)
?