I'm working on a tower defense game and my "enemy" game object is losing health before my "projectile" hits the box collider

In my tower defense game I have a turret that spawns a projectile that heads towards an game object with the tag "Enemy" when said enemy game object is in range of the turret but for some reason my enemy health will decrease before my projectile will hit the enemy collider I'm not to sure where my mistake is can someone tell me how I can fix this problem. I should mention that my enemy game object has a box collider and my projectile game object does not.

this is my projectile script

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class Projectile : MonoBehaviour
 {
     private Transform target;
 
     public float speed = 70f;
 
     public GameObject impactEffect;
 
     public int damage = 10;
 
     public float explosionRadius = 0f;
 
     public void Seek(Transform _target)
     {
         target = _target;
     }
 
     // Update is called once per frame
     void Update()
     {
         if (target == null)
         {
             Destroy(gameObject);
             return;
         }
         Vector3 dir = target.position - transform.position;
 
         float distanceThisFrame = speed * Time.deltaTime;
 
         if (dir.magnitude <= distanceThisFrame)
         {
             HitTarget();
             return;
         }
 
         transform.Translate(dir.normalized * distanceThisFrame, Space.World);
 
         transform.LookAt(target);
     }
 
     void HitTarget()
     {
 
         GameObject effectIns = (GameObject)Instantiate(impactEffect, transform.position, transform.rotation);
 
         Destroy(effectIns, 5f);
 
         if(explosionRadius > 0f)
         {
             Explode();
         }
 
         else
         {
             Damage(target);
 
             Destroy(effectIns);
         }
     }
 
     void Explode()
     {
         Collider[] colliders = Physics.OverlapSphere(transform.position, explosionRadius);
 
         foreach(Collider collider in colliders)
         {
             if(collider.tag == "Enemy")
             {
                 Damage(collider.transform);
             }
         }
     }
 
     void Damage(Transform enemy)
     {
         Enemy e = enemy.GetComponent<Enemy>();
 
         if(e != null)
         {
             e.TakeDamage(damage);
         }
 
         
     }
 
 
     void OnDrawGizmosSelected()
     {
         Gizmos.color = Color.red;
 
         Gizmos.DrawWireSphere(transform.position, explosionRadius);
     }
 
 }
 

and this is my enemy script

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.UI;
 
 public class Enemy : MonoBehaviour
 {
     public float startSpeed = 10f;
 
     public float speed;
 
     public float startHealth = 200f;
 
     private float health;
 
     public int moneyEarned = 10;
 
     public GameObject deathEffect;
 
     [Header("Health Bar")]
     public Image healthBar;
 
     void Start()
     {
         health = startHealth;
 
         speed = startSpeed;
     }
 
 
     //enemy damage
     public void TakeDamage(float amount)
     {
         health -= amount;
 
         healthBar.fillAmount = health / startHealth;
 
         if (health <= 0)
         {
             Die();
         }
     }
 
 
     public void Slow (float pct)
     {
         speed = startSpeed * (1 - pct); 
     }
 
 
     void Die()
     {
         GameObject audioManagerObject = GameObject.Find("AudioManager");
         AudioManager audioManagerScript = audioManagerObject.GetComponent<AudioManager>();
         audioManagerScript.PlayEnemyDeath();
 
         //Enemy prefab >> Death effect >> plug in death effect
         GameObject effect = Instantiate(deathEffect, transform.position, Quaternion.identity);
 
         Destroy(effect, 1f);
 
         PlayerStats.Money += moneyEarned;
 
         WaveSpawner.EnemiesAlive--;
 
 
         Destroy(gameObject);
     }
 }