Prefabs are Tiny

I have put a lot of walls in my scene, and then i made all of them childs of just one wall, so my hud don’t gets full. But i have a problem.

Now everytime i put a prefab, they are so small like 0,1% of the walls. The walls are in normal scale, but it seems that Unity is spawning the prefabs with 0.000000001 scale! WTF?!

I’ve found it common to need to set my scale manually when instantiating prefabs, but usually just on the root object. This is best done after the call to SetParent()

obj.transform.localScale = Vector3.one;