Animating multiple of the same prefab

Hello forum,
I have been struggling to find the solution to my problem, perhaps from lack of knowing where to start.

i have this issue as i have created a spawn object that will spawn 4 skeletons behind a wall, then the skeleton will travel towards me, initially idle animation, then walking animation into attack animation.

I can not get all 4 to properly animate, while 1 skeleton is working perfectly the other 3 skeletons remain in the idle animation.

i will inclue my enemy chase/animation script
and my spawn enemy script
i have also included a video.

any help appreciated as i am still learning i hope you can keep it fairly friendly lol.

Code (CSharp):

1.  
2. using System.Collections;
3. using System.Collections.Generic;
4. using UnityEngine;
5.  
6. public class Chase : MonoBehaviour
7. {
8.     public Transform player;
9.    
10.     static Animator anim; //create the animator
11.     // Start is called before the first frame update
12.     void Start()
13.     {
14.         player = GameObject.FindWithTag("MainCamera").transform;
15.         anim = this.GetComponent<Animator>(); // set the anim value, we need this or animator will remain empty
16.     }
17.  
18.     // Update is called once per frame
19.     void Update()
20.     {
21.         if (Vector3.Distance(player.position, this.transform.position) < 10) //testing distance between player and skeleton, if its less than 10
22.         {
23.             Vector3 direction = player.position - this.transform.position; //face player
24.             direction.y = 0; //ignore y axis
25.             this.transform.rotation = Quaternion.Slerp(this.transform.rotation, Quaternion.LookRotation(direction), 0.1f); //rotate to face player.
26.             if (direction.magnitude < 5 && direction.magnitude > 1) //if we are within range (5)
27.             {
28.                 this.transform.Translate(0, 0, 0.05f); //move skeleton to us on z axis (the >1 value above stops it entering into us)
29.                 anim.SetBool("isAttacking", false); //stop attacking animation
30.                 anim.SetBool("isIdle", false); //stop idle animation
31.                 anim.SetBool("isWalking", true); // activate the walking animation
32.  
33.             }
34.             if (direction.magnitude <= 1) // when skeleton reaches us
35.             {
36.                 anim.SetBool("isAttacking", true); //attack animation
37.                 anim.SetBool("isWalking", false);
38.                 anim.SetBool("isIdle", false);
39.             }
40.             if (direction.magnitude >= 5) //if we go out of range
41.             {
42.                 anim.SetBool("isIdle", true);
43.                 anim.SetBool("isWalking", false);
44.                 anim.SetBool("isAttacking", false);
45.             }
46.         }
47.     }
48. }
49.  

Code (CSharp):

1.  
2. using System.Collections;
3. using System.Collections.Generic;
4. using UnityEngine;
5.  
6. public class SpawnManager : MonoBehaviour
7. {
8.         public GameObject enemy;
9.     public float xPos; //base integer
10.     public float yPos;
11.     public float zPos;
12.     public float xPosM; //max range integer
13.     public float yPosM;
14.     public float zPosM;
15.     public int enemyCount;
16.     // Start is called before the first frame update
17.     void Start()
18.     {
19.         StartCoroutine (EnemyDrop());
20.     }
21.     IEnumerator EnemyDrop()
22.     {
23.         while (enemyCount < 4)
24.         {
25.             xPos = Random.Range(xPos, xPosM);
26.             zPos = Random.Range(zPos, zPosM);
27.             Instantiate(enemy, new Vector3(xPos, yPos, zPos), Quaternion.identity);
28.             yield return new WaitForSeconds(1.4f);
29.  
30.             enemyCount += 1;
31.         }
32.     }
33. }
34.