Why does Starkiller hold his lightsaber backwards in the PS3, XBOX 360 and PC versions of The Force Unleashed but not the Wii, PS2 and PSP Versions?

Starkiller, also known as Galen Marek was the main character of the Star Wars: Force Unleashed video game and its sequel. He’s mainly known for holding his lightsaber backwards. Which we see him do in the PS3, XBOX 360 and PC versions of the game (as well as all versions of the second game). But not the Wii, PSP and PS2 versions. He does hold it backhanded at the end of one of the coruscant fights as well as when you encounter Rahm Khota on Nar Shadaa. But other than that he pretty much holds it facing forward for most of the game. So why does he hold it backwards in the PS3, XBOX 360 and PC versions but not the Wii, PSP or PS2 versions
Why does Starkiller hold his lightsaber backwards in the PS3, XBOX 360 and PC versions of The Force Unleashed but not the Wii, PS2 and PSP Versions?
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