About why if i rotate or scale on prebaf(3d object) in AR all the others are also getting scaled or rotated

When I make multiple types of ar objects using the method above, it seems that all objects follow the same command when I rotate or scale a single object.
How to overcome this issue. Also i have created a canvas and all the buttons with these object are a child to the canvas. How to overcome this that when i touch an object and scale them only that should get rotated or scaled. Please to resolve this