Basically, I have two scripts so that one (ScrollView.cs) is responsible for ScrollView and other(CameraControl.cs) is for zooming by using mouse wheel.
Zooming codes are in LateUpdate.
Scrolling codes are in OnGUI.
The problem is obvious, I do not want to zoom in-out when user is scrolling the ScrollView.
I also tried the changing order of script execution. But nevermind, I do not know why but it did not work.
Thanks in advance.