One script says the variable is 0 but the other says -37

Ok, so this is the first time I am going to be asking a question but before I do it I would like you guys to know that I started coding in c#+unity a few days ago. So sorry if my code is a bit sloppy. I am using this tutorial series by Brackley on a tower defense game but I stopped watching and continued to code the rest of it myself. Currently, I have a WaveSpawner script setting numOfEnemies and numOfEnemies2 to 0. When I logged it was always correct going up by 1, 2 and etc. But in the other script Enemy.cs I got the script and I am trying to make the numOfEnemy and numOfEnemy2 go down by one. But instead, when I debug it, it comes out as -37 for both. But when I log both of the values in the two different scripts at the same time the wavespawner script still has the correct number 0, 1, 2 etc and the enemy has -37, -36. Thank you for the help!

Enemy.cs

 using UnityEngine;
 using System.Collections;
 
 public class Enemy : MonoBehaviour {
 
     [Header("Attributes")]
     public float enemyHealth;
     public GameObject deathEffect;
 
     public GameObject gameCore;
 
     private string enemy1 =  "Enemy"; 
     private string enemy2 =  "Enemy2";
 
 
 
     void Update()
     {
 
         WaveSpawner gameCoreScript = (WaveSpawner)gameCore.GetComponent("WaveSpawner");
 
         GameObject currentEnemy = gameObject;
 
         string currentEnemyTag = currentEnemy.tag;
 
 
         if (enemyHealth <= 0) {
 
             if (currentEnemyTag == enemy2) {
 
                 //Debug.Log ("Enemy2 Killed!");
                 //Debug.Log (gameCoreScript.numOfEnemy2 + "Enemy2 remain!");
                 //gameCoreScript.numOfEnemy2 -= 1;
 
             } else if (currentEnemyTag == enemy1) {
                 Debug.Log (gameCoreScript.numOfEnemy);
                 //Debug.Log("Enemy Killed!");
                 //Debug.Log (gameCoreScript.numOfEnemy + "Enemy remain!");
                 //gameCoreScript.numOfEnemy -= 1;
 
             }
 
 
             GameObject effectHealthIns = (GameObject)Instantiate (deathEffect, transform.position, transform.rotation);
             Destroy (effectHealthIns, 2f);
             Destroy (gameObject);
         }
     }
 
 }
 
 

WaveSpawner.cs

 using UnityEngine;
 using System.Collections;
 using UnityEngine.UI;
 
 public class WaveSpawner : MonoBehaviour {
 
     [Header("Game Mechanics")]
     public Transform enemyPrefab;
     public Transform enemy2Prefab;
     public Transform spawnPoint;
     public Text waveCountdownText;
     public Text remainingEnemiesText;
 
     [Header("Game Attributes")]
     public float timeBetweenSpawns = 0.5f;
     public float timeBetweenWaves = 5f;
 
 
     private float countdown = 2.5f;
     private float waveNumber = 0;
 
     public int waveIndex = 0;
     public float numOfEnemy = 0;
     public float numOfEnemy2 = 0;
 
 
 
 
     void Update()
     {
         //Debug.Log (numOfEnemy);
         //Debug.Log (numOfEnemy2);
         if (countdown <= 0f) 
         {
             StartCoroutine(SpawnWave());
             countdown = timeBetweenWaves;
             waveNumber = waveNumber + 1;
         }
             
 
         countdown -= Time.deltaTime;
 
         float enemiesLeft = numOfEnemy + numOfEnemy2;
         waveCountdownText.text = Mathf.Round(waveNumber).ToString();
         remainingEnemiesText.text = Mathf.Round(enemiesLeft).ToString();
     }
 
     IEnumerator SpawnWave ()
     {
         waveIndex++;
         Debug.Log ("Wave Coming!");
 
         for (int i = 0; i < waveIndex; i++) {
                 numOfEnemy = numOfEnemy + 1;
                 SpawnEnemy ();
                 yield return new WaitForSeconds (timeBetweenSpawns);
             if (numOfEnemy > waveNumber  && numOfEnemy2 < waveNumber) 
                 {
                 numOfEnemy2 = numOfEnemy2 + 1;
                     SpawnEnemy2 ();
                 yield return new WaitForSeconds(timeBetweenSpawns);
                 }
             }
 
             }
 
         
 
 
 
 
 
     void SpawnEnemy()
     {
             Instantiate (enemyPrefab, spawnPoint.position, spawnPoint.rotation);
     }
 
 
 
     void SpawnEnemy2()
     {
         Instantiate (enemy2Prefab, spawnPoint.position, spawnPoint.rotation);
 
 }
 
 }