I can't have more enemies at the same time.

Hey Unity people. when i have one enemy in my scene, both my damage- and healthscript works fine, but when i duplicate my enemy i cant do damage to the original object. Here is my PlayerAttackScript :

 using UnityEngine;
 using System.Collections.Generic;
 using System.Collections;
 
 public class PlayerAttack : MonoBehaviour {
     public int Damage = 10;                    //The Players BaseDamage
     public int MeleeDamage = 10;            //The Players MeleeDamage
     public int RangedDamage = 15;            //The Players RangeDamage
     private float PlayerDistance;            //The Players Distance
     private Transform myTransform;            //The Players transform
     private Transform target;                //The Enemyes transform
     public List<GameObject> EneList;        //The Enemies List
     public GameObject prefab;
     public Transform selectTarget;
     
     void Awake(){
         myTransform = transform;    //Sets MyTransform = Players transform
         PlayerDistance = 2;            //The Distance of the players attack
 
     }
 
     void Start(){
         EneList = new List<GameObject>();
         selectTarget = null;
         AddAllEnemies();
 
     }
     public void AddAllEnemies(){
         GameObject[] go = GameObject.FindGameObjectsWithTag("Enemy");
 
         foreach(GameObject enemy in go)
             AddTarget(enemy.gameObject);
     }
 
     public void AddTarget(GameObject enemy){
         EneList.Add(enemy);
     }
 
     // Update is called once per frame
     void Update () {
         GameObject ThePlayer = GameObject.FindWithTag("Player");
         PlayerStamina PlayerStam = ThePlayer.GetComponent<PlayerStamina>();
 
         if(Input.GetKeyDown(KeyCode.R)){                            //If R is pressed
             if(PlayerStam.StaminaE == true){                        //If player has enought Stamina
                 if(PlayerDistance <= 2){                            //Checks that the distance is smaller than the MaxDistance
                     gameObject.SendMessage("StaminaHit", 20.0f);
                     GameObject.FindWithTag("Enemy").SendMessage("DamageEnemy", 20.0f);
                 }
             }
         }
         GameObject go = GameObject.FindGameObjectWithTag("Enemy");                        //sets the var target to a transform
         target = go.transform;                                                            //Makes the target = the Enemys transform
 
         PlayerDistance = Vector3.Distance(target.position, myTransform.position);        //Checks the Enemys Distance from Player
     }
 }

And this is my EnemyHealthScript :

 using UnityEngine;
 using System.Collections;
 
 public class EnemyHealth : MonoBehaviour {
     public int EneHealth = 200;
     public int EneCurHealth = 200;
 
     void DamageEnemy (int Damage){
         GameObject TheEnemy = GameObject.FindWithTag("Enemy");
         EnemyAI EnemyAI = TheEnemy.GetComponent<EnemyAI>();
         if(EnemyAI.distance <= 2){
             EneCurHealth -= Damage;
         }
     }
 
 
     // Update is called once per frame
     private void Update () {
 
         if(EneCurHealth <= 0){
             EneCurHealth = 0;
         }
 
         if(EneCurHealth == 0){
         Destroy(gameObject);
         }
     }
 }

Thank you in Advance.