Want to frame multiple objects in camera view using render bounds

Hello, I am trying to get the camera to frame multiple spawned objects. When I try this with a single item the camera frames it properly but when I try with a list of items the camera moves to 0,0,0.

The objects are visible in the scene.
Each GameObject has a child with a Mesh Renderer and Box Collider.
I add the objects to a list (gridSCR.listOfGridTiles) when they are spawned. The objects are definitely in the list

Here is my C# code:

 public Bounds CalculateBounds(GameObject objectToCheck) {
     Bounds bounds = new Bounds(objectToCheck.transform.position, Vector3.zero);
     Object[] rList = objectToCheck.GetComponentsInChildren(typeof(Renderer));
     // Get the bounds of each childs renderer
     foreach (Renderer r in rList) {
         // Add the bounds together
         bounds.Encapsulate(r.bounds);
     }
     return bounds;
 }

 public void ZoomToAll(){
     Bounds totalBounds = new Bounds();
     // Loop through a list of game objects
     for (int i = 0; i < gridSCR.listOfGridTiles.Count; i++){
         // Add the bounds of each game object together
         totalBounds.Encapsulate (CalculateBounds(gridSCR.listOfGridTiles[i]));
         Debug.Log("Total bounds = " + totalBounds);
     }

     Vector3 max = totalBounds.size;
     float radius = Mathf.Max(max.x, Mathf.Max(max.y, max.z));
     float dist = radius /  (Mathf.Sin(mainCamera.fieldOfView * Mathf.Deg2Rad / 2f));
     Debug.Log("Radius = " + radius + " dist = " + dist);
     // Position the camera at the bounds center
     mainCamera.transform.position = totalBounds.center;
     // Offset the camera to frame object
     mainCamera.transform.Translate (0 ,0, -dist);    
 }

Debug log from above: Total bounds = Center: (0.0, 0.0, 0.0), Extents: (0.0, 0.0, 0.0)

I'm a coder noob so any help you could provide would be greatly appreciated. :)

Thanks in advance. - yackbladder