Problems with instantiating new object prefabs

Code (CSharp):

1. public class BallSpawner : MonoBehaviour
2. {
3.     public GameObject ball;
4.  
5.     private System.Random random = new System.Random();
6.     private Vector3 spawnPos;
7.  
8.     // Update is called once per frame
9.     void FixedUpdate()
10.     {
11.         if (Input.GetKey("r")) {
12.             spawnPos = new Vector3(random.Next(-7, 7), 35, 21);
13.        
14.             Instantiate(ball, spawnPos, Quaternion.identity);
15.         }
16.     }
17. }

I am trying to spawn in a new ball at a random x coordinate (-7 to 7), and then at 35 y and 21 z. However, the ball always spawns at the same x coordinate even though I am randomly generating a new one for each ball spawn. The x coordinate the newly instantiated ball always spawns at is the starting x position of the original ball (basically, there is one starting ball, and then you can press "r" to spawn in more, and I want those to spawn at random x locations -7 to 7).

Why is it doing this, and what should I do to get it to do what I want?

 

There's not really any reason this shouldn't work... This should really be in Update() rather than FixedUpdate() though.

Are there any scripts attached to the ball object? Is the ball a prefab, or an object in the scene hierarchy?

 

The ball is a prefab. The ball has a script on it called moveBall. Here it is: any help is appreciated.

Code (CSharp):

1. public class MoveBall : MonoBehaviour {
2.  
3.  
4.  
5.     public Rigidbody rb;
6.  
7.     private Vector3 StartPos = new Vector3(-4, 35, 21);
8.     private Vector3 Move = new Vector3(10, 0, 0);
9.     private bool Dropped = false;
10.  
11.     // Start is called before the first frame update
12.     void Start() {
13.         transform.position = StartPos;
14.     }
15.  
16.     // Update is called once per frame
17.     void FixedUpdate() {
18.  
19.         if (!Dropped) {
20.             if (Input.GetKey("a") && transform.position.x > -7) {
21.                 transform.position -= Move * Time.fixedDeltaTime;
22.             }
23.  
24.             if (Input.GetKey("d") && transform.position.x < 7) {
25.                 transform.position += Move * Time.fixedDeltaTime;
26.             }
27.         }
28.         if (Input.GetKey("space")) {
29.             Dropped = true;
30.             rb.useGravity = true;
31.         }
32.  
33.     }
34. }