I think dual wield switch on the PC version of game is not bug. In case it is a bug then it should be happening because of poor planning. Which side would be right shoot in the game? the aim should be at the left side and aim would be at the right side. This will be done for the shooters for the long period of time. Someone has program it for the aim to become the left shoot on the gaming console. But when it comes for the PC version of the game the aim would become right and right shoot would go for left.
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