My iPhone 4 wallpaper won't stay still?

I have an iphone 4.(jailbroken)So I got this picture (from google) and I wanted to set it as my wallpaper for my home screen but when I set it and I go to the home screen to see it, every time I move my phone, my wallpaper moves kind of with the direction I'm moving the phone. Is there a way to stop this? Or is that the way it's suppose to be?

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