Updating Array inside a List

Greetings,

I'm currently facing a problem regarding update values of several arrays inside a list. The basic setup is the following: a List containing 3 arrays each comprised of 16 float numbers. My problem is regarding the update of the each array, whenever I update one, it also affects ALL other arrays present in the list, something that I don't want to happen. The update of each array is made by calling the FindHomography function.

The code is as follows (for a matter of simplicity I omitted most of the code, however I can post more if needed):

     public float[] matrix = new float[16];
     public const int arraySize = 16;
     public List<float[]> matrixList;
     
     void Start () {
             InitMatrixList();
             }
         
         void InitMatrixList(){
         
                 int numPlanes = manager.numExistPlanes;
                 matrixList = new List<float[]>();
                 for(int i = 0; i <= numPlanes; i++){
                     matrixList.Add(matrix);
                     Debug.Log ("Matrix added");
                 }
             }
         void LateUpdate () {
         
         planeMatrixNum = manager.activePlaneNum;
         matrix = matrixList[planeMatrixNum]; 
         FindHomography(ref source, ref destination, ref matrix);
         
         }
     

Also I don't really know if it's relevant since I have very little experience but these matrix values are used within a shader (not written by me).