Filling the board in a match 3 game,Match 3, generating code

Hello. I am obviously new to unity and i have problems with generating a board for a match 3 game. The code used for generating the board goes like this:

 public class Board : MonoBehaviour
 
 {
     public GameObject[] dots; //array of the dots
     public int width; //width of the matrix
     public int height; //height of the matrix
     public GameObject tilePrefab; //background image gameobject
     private BackgroundTile[,] allTiles; //2d array of all backgrounds
     public GameObject[,] allDots; //2d array of all dots
     void Start()
     {
         allTiles = new BackgroundTile[width, height];
         allDots = new GameObject[width, height];
         SetUp();
     }
 
     private void SetUp() //fills the arrays
     {
         for (int i = 0; i < width; i++)
         {
             for (int j = 0; j < height; j++)
             {
                 Vector2 tempPosition = new Vector2(i, j);
                 GameObject backgroundTile = Instantiate(tilePrefab, tempPosition, Quaternion.identity) as GameObject;
                 backgroundTile.transform.parent = this.transform;
                 backgroundTile.name = "(" + i + "," + j + ")";
                 int dotTouse = Random.Range(0, dots.Length);
                 GameObject dot = Instantiate(dots[dotTouse], tempPosition, Quaternion.identity);
                 dot.transform.parent = this.transform;
                 dot.name = "(" + i + "," + j + ")";
                 allDots[i, j] = dot;
             }
         }
     }
 }
 

But the dots which are supposed to be on place [1,height] are placed in [0,height] and i don't know what to do about it