Question Changing one terrain is changing others.

Hi, I was using a terrain from an asset. I multipled it and used it on other scene. Before changing them I unpacked them so they don't have any prefabs at asset folder. After that I added new terrain datas to them. And after that Is started making changings but from different scenes all of the terrains are being same as the last one I made. Like in one of the scene I am making a terrain height 5 and flatten tile and all of those terrains from different scenes changes. How can I fix that?

 

Having the same issue, any solutions?