Overlapping text in the inspector

That's odd.

Hard to tell without seeing your code, but I think there's a problem in your code just before you iterate through your Pooling List.

A few ideas :

• a GUILayout.BeginHorizontal() or Vertical that wasn't closed

• a background color that was set to Color.Clear (transparency)

I don't use GUILayout. Only this: public ObjectPoolingList[] ObjectPoolingLists;