List values change for no apparent reason

Hi there, this is my first post on here, so sorry if I do not follow a proper format or something.

Essentially, I have two lists of GameObjects. Both lists are the same length. One list is a reference and the other list (let's call this the normal list) are those same elements but in a different order. What I want to do is to match the positions of each element in the normal list to the position of the same-indexed element in the reference list.

What I have written already works perfectly except for two GameObjects. For some reason in my first and second loop of the for-loop, two positions in my reference list just change for no reason that I can tell.

Here is my code:

 private void rotate(List<GameObject> cubeList)
   {
     //make a copy of cubeList to reference
     List<GameObject> referenceList = copyList(cubeList);
 
     //change the cube list
     //get temporary values of the first corner and first middle
     GameObject tempCorner = cubeList[cubeList.Count - 2];
     GameObject tempMiddle = cubeList[cubeList.Count - 1];
     
     //move the corners and middles accordingly in the list
     for(int i = cubeList.Count - 1; i > 1; i--)
     {
       cubeList[i] = cubeList[i - 2];
     }
     //change the first and second cube spots
     cubeList[0] = tempCorner;
     cubeList[1] = tempMiddle;
 
     //actually move the cubes now by making the cube list position equal to the reference list position
     for(int i = 0; i < cubeList.Count; i++)
     {
       cubeList[i].transform.position = referenceList[i].transform.position;
       cubeList[i].transform.Rotate(new Vector3(0, 0, -90));
     }
   }

 private List<GameObject> copyList(List<GameObject> list)
   {
     List<GameObject> copyList = new List<GameObject>(); 
 
     for(int i = 0; i < list.Count; i++)
     {
       copyList.Add(list[i]);
     }
 
     return copyList;
   }

Here are some of my debugger statements, so you can see what I am talking about.

 Proper Reference List: 
 (-1.0, 1.0, -1.0), (0.0, 1.0, -1.0), (1.0, 1.0, -1.0), (1.0, 0.0, -1.0), (1.0, -1.0, -1.0), (0.0, -1.0, -1.0), (-1.0, -1.0, -1.0), (-1.0, 0.0, -1.0), 
 
 Pass 0:
 Reference List:
 (-1.0, 1.0, -1.0), (0.0, 1.0, -1.0), (1.0, 1.0, -1.0), (1.0, 0.0, -1.0), (1.0, -1.0, -1.0), (0.0, -1.0, -1.0), (-1.0, 1.0, -1.0), (-1.0, 0.0, -1.0), 
 Cube List: 
 (-1.0, 1.0, -1.0), (-1.0, 0.0, -1.0), (-1.0, 1.0, -1.0), (0.0, 1.0, -1.0), (1.0, 1.0, -1.0), (1.0, 0.0, -1.0), (1.0, -1.0, -1.0), (0.0, -1.0, -1.0), 
 
 Pass 1:
 Reference List:
 (-1.0, 1.0, -1.0), (0.0, 1.0, -1.0), (1.0, 1.0, -1.0), (1.0, 0.0, -1.0), (1.0, -1.0, -1.0), (0.0, -1.0, -1.0), (-1.0, 1.0, -1.0), (0.0, 1.0, -1.0), 
 Cube List: 
 (-1.0, 1.0, -1.0), (0.0, 1.0, -1.0), (-1.0, 1.0, -1.0), (0.0, 1.0, -1.0), (1.0, 1.0, -1.0), (1.0, 0.0, -1.0), (1.0, -1.0, -1.0), (0.0, -1.0, -1.0), 
 
 Pass 2:
 Reference List:
 (1.0, 1.0, -1.0), (0.0, 1.0, -1.0), (1.0, 1.0, -1.0), (1.0, 0.0, -1.0), (1.0, -1.0, -1.0), (0.0, -1.0, -1.0), (-1.0, 1.0, -1.0), (0.0, 1.0, -1.0), 
 Cube List: 
 (-1.0, 1.0, -1.0), (0.0, 1.0, -1.0), (1.0, 1.0, -1.0), (0.0, 1.0, -1.0), (1.0, 1.0, -1.0), (1.0, 0.0, -1.0), (1.0, -1.0, -1.0), (0.0, -1.0, -1.0), 
 
 Pass 3:
 Reference List:
 (1.0, 1.0, -1.0), (1.0, 0.0, -1.0), (1.0, 1.0, -1.0), (1.0, 0.0, -1.0), (1.0, -1.0, -1.0), (0.0, -1.0, -1.0), (-1.0, 1.0, -1.0), (0.0, 1.0, -1.0), 
 Cube List: 
 (-1.0, 1.0, -1.0), (0.0, 1.0, -1.0), (1.0, 1.0, -1.0), (1.0, 0.0, -1.0), (1.0, 1.0, -1.0), (1.0, 0.0, -1.0), (1.0, -1.0, -1.0), (0.0, -1.0, -1.0), 

and so forth.

Pass 0 and Pass 1 are the only things that don't work (look at the last two positions, they change on the reference list when they shouldn't).

I am completely stumped. I have been trying other ways, really all I can think of, but referenceList continues to be altered. It is baffling me. Any help would be appreciatedQ