Problem with combat.

So I have this specific problem. I'm following BurgZergArcade tutorials, but I wanted to implement them to something of my own. (Think 2.5D platformer) So the problem is as follows: When attacking from the left everything is fine. I hit the target when facing it and missing when facing away, but when hitting from the right side I can hit it no matter if I'm facing the enemy or not.

 using UnityEngine;
 using System.Collections;
 
 public class PlayerAttack : MonoBehaviour {
     public GameObject target;
     public float attackTimer;
     public float cooldown;
 
     // Use this for initialization
     void Start () {
         attackTimer = 0;
         cooldown = 1.0f;
     }
     
     // Update is called once per frame
     void Update () 
     {        
         if(attackTimer > 0)
         {
             attackTimer -= Time.deltaTime;
         }
         
         if(attackTimer < 0)
         {
             attackTimer = 0;
         }
         
         if (Input.GetKeyUp(KeyCode.F))
         {
             if(attackTimer == 0)
             {
                 Attack();
                 attackTimer = cooldown;
             }
         }
     
     }
     
     private void Attack()
     {
         float distance = Vector3.Distance(target.transform.position, transform.position);
         
         Vector3 dir = (target.transform.position - transform.position).normalized;
         
         float direction = Vector3.Dot(dir, transform.forward);
         
         Debug.Log(direction);
         Debug.Log(distance);
         
         if(distance < 3)
         {
             if(direction >= 0)
             {
                 EnemyHealth eh = (EnemyHealth)target.GetComponent("EnemyHealth");
                 eh.AdjustCurrentHealth(-10);
             }
         }
     }
 }
 

problem seems to be that "direction" is exactly 0 when attacking from left or right, if player is looking right. Any advice?