Cant See More Than Two Levels Of Children In The Project Tab

In the project tab I am having trouble with seeing the children components of a prefab if there are two levels of children. For example, Object One has a child object two, object two has a child. In the project tab on the prefab I can go to object two and it does not give me the drop down arrow to view the contents of the child. Is this a bug or am I not seeing something?