One cable out of 10 is defective due to a manufacturing defect. The middle 2 pins on one side have been swapped so that 1-2-3-4 on one end is 1-3-2-4 on the other end. It is clear that these cables are not checked after production, and if they are checked, it is not very good. Luckily the fan I connected it to wasn't damaged.
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