Scrolling Background Problem on Iphone 5

Hello, guys. I've just published my game for Iphone. I have Iphone 6 and everything works fine on it. My friend downloaded the game on his iPhone 5 and the background become a mess.

Here on my iPhone 6:


Here on his iPhone 5:


I'm using the texture offset to make the scrolling effect.
Any Ideas what could be wrong?

PS: It works fine on Android devices.

Thank You