Spawning Enemy spawns more then MaximumEnemy?

o, SO i set up this simple enemy spawner and when you kill one it spawns another awesome, however I end up with 20 Medium enemies rather then a maximum of 5..... any Idea's on why its going over the limit?

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class SpawnEnemy : Photon.MonoBehaviour {
 
 
     public float maximumEnemy = 20;
     public float maximumEnemyMedium = 5;
     private GameObject SpawnLocation;
 
     public GameObject[] Enemies;
     public int index;
 
     public GameObject[] Enemies2;
     public int index2;
 
     // Use this for initialization
     void Start () {
         SpawnLocation = this.gameObject;
     }
     
     // Update is called once per frame
     void Update () {
         if (PhotonNetwork.isMasterClient == true) {
 
             Enemies = GameObject.FindGameObjectsWithTag ("EnemySmall");
             index = Enemies.Length;
 
             Enemies2 = GameObject.FindGameObjectsWithTag ("EnemyMedium");
             index2 = Enemies2.Length;
 
             if (index > maximumEnemy) 
                 return;
             
                 GameObject Clone = PhotonNetwork.Instantiate ("Enemy", SpawnLocation.transform.position, SpawnLocation.transform.rotation, 0);
 
             if (index2 > maximumEnemyMedium)
                 return;
                 GameObject Clone2 = PhotonNetwork.Instantiate ("EnemyMedium", SpawnLocation.transform.position, SpawnLocation.transform.rotation, 0);
             
             
         }
     }
 
 
     //-----------------------------------------------------------------------------------------------------------
 
 
 }