Problem with Graphics.DrawTexture

I try to implement a way to show a part of my image on GUI. And I end up using Graphics.DrawTexture like this

Graphics.DrawTexture(drawBounds, currentTexture, new Rect(0.5f, 0f, 1f, 1f), 0, 0, 0, 0);

But I end up got this on my Editor and Android too

This is my texture I tried to move the source rectangle by adjust x in source rectangle

I set my texture type as many type unity have but none of all succeed.

Please help me fix this.

Thanks for reading my post.