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based on your example:
--> for commom mode (noise) both path´s inductance are in parallel, the total inductance should be 1mH/2=0.5mH. Why total inductance is 2mH.
This is true for independent inductances only. But you have two windings on one core. They are not independent. Thus they add/subtract.the total inductance should be 1mH/2=0.5mH