Offset and Tiling Problem in Parallax

Hi everyone ,
i am making 2d parallax using Shader offset property of Texture and my code is given below.

renderer.material.mainTextureOffset = Vector2 (offset, 0);

it is working fine in unity Game layout after playing,and i am using texture in curve shape.but problem is when i run the build in iPhone the curvy shape of texture is showing in the square shape.I have changed the shader properties to a large extent to resolve the issue but still do not know ,why is it happening so.

i have attached the screen shot of both Scene.

 

The offset should remain in the 0.0 - 1.0 range, since the GPU in iOS devices doesn't like it when UVs are too far from the origin.

--Eric

 

Thanks for the answer,But can you please elaborate this...