Problems When Shooting Multiple Enemies round about 4 times

When I have Multiple Enemies they have a float number for health round about 250.0f so when i shoot at one of them that number should decrease by 50 each time i shoot at the enemy but heres my problem the first enemy dies round about 4/5 shots to it but when i start to shoot at the other (after the first enemy) It takes 1 shot and there dead so heres the Bullet script for the players Bullet called Bullet.cs:

 using UnityEngine;
 using System.Collections;
 
 public class Bullet : MonoBehaviour {
     
     public GameObject BulletObject;
     public GameObject GlobelObjectExplosion;
     public GameObject GlobelBulletExplosion;
     public float life = 3.0f;
     private EnemyAI enemy;
 
     
     private Transform bulletTransform;
     // Use this for initialization
     void Start () {
     
     }
     
     void OnTriggerEnter(Collider other)
     {
         if(other.gameObject.tag == "Enemy")
         {
             
             EnemyAI.currEnemyLife -= 50;
             Player.score += 50;
             
             //Creates an explosion on collision
             GameObject objBullet = Instantiate(GlobelBulletExplosion, transform.position, Quaternion.identity) as GameObject;
             Destroy(objBullet, 2.0f);
             
             Debug.Log("ColliderWorking");
             
             if(EnemyAI.currEnemyLife <= 0.0f)
             {
                 Destroy(other.gameObject);
                 
                 //creates an explosion when enemy is destoryed
                 GameObject obj = Instantiate(GlobelObjectExplosion, other.gameObject.transform.position, Quaternion.identity) as GameObject;
                 
                 Destroy(obj, 2.0f);
                 Player.score += 250;
             }
             Destroy(gameObject);
         }
     }
     
     // Update is called once per frame
     void Update () {
 
         life -= Time.deltaTime;
         
         transform.Translate(0, 0, Player.bulletSpeed * Time.deltaTime);
         
         if(life <= 0.0)
         {
             
             Destroy(gameObject);
             
         }
     
     }
 }

And heres the EnemyAI Script called EnemyAI.cs:

 using UnityEngine;
 using System.Collections;
 
 public class EnemyAI: MonoBehaviour {
     
     public Transform target;
     public int moveSpeed;
     public int rotationSpeed;
     public GameObject explosion;
     
     public static float maxEnemyLife = 250.0f;
     public static float currEnemyLife;
     public static float maxEnemyBullets = 60.0f;
     public static float currEnemyBullets;
     public static float maxEnemyFuel = 1260.0f;
     public static float currEnemyFuel;
     
     private Transform myTranform;
     public static Transform LocalTransform;
     
     void Awake(){
     
         myTranform = transform;
         LocalTransform = myTranform;
         
     }
 
     // Use this for initialization
     void Start () {
         if(GameObject.FindGameObjectWithTag("Player") != null){
             GameObject go = GameObject.FindGameObjectWithTag("Player");
             
             currEnemyFuel = maxEnemyFuel;
             currEnemyLife = maxEnemyLife;
             currEnemyBullets = maxEnemyBullets;
     
             target = go.transform;
         }
         
         
     
     }
     
     // Update is called once per frame
     void Update () {
         if (currEnemyFuel > maxEnemyFuel)
         {
             currEnemyFuel = maxEnemyFuel;    
         }
     
             //Debug.DrawLine(target.position, myTranform.position, Color.cyan);
         if(currEnemyFuel <= 0.0)
         {
                 currEnemyFuel = 0.0f;
                 //myTranform.rotation = Vector3.zero;
                 //myTranform.position = Vector3.zero;
             moveSpeed = 0;
         }
         else if (currEnemyFuel > 0.0)
         {
             //Look at target
             if(GameObject.FindGameObjectWithTag("Player") != null){
                 myTranform.rotation = Quaternion.Slerp(myTranform.rotation, Quaternion.LookRotation(target.position - myTranform.position), rotationSpeed * Time.deltaTime);
             
                 //Move towards Target
                 myTranform.position += myTranform.forward * moveSpeed * Time.deltaTime;
                 currEnemyFuel -= 0.2f;
             }
             
         }
         
     
     }
 }

Ive tried to find if someone had the some problem or if theres a workaround but i can find a solution on here or google. So can someone tell me if im doing something wrong or is there a tutorial or something