player prefab messing up the scores

This is very confusing to me so I am going to try and explain it the best I can.

Right so I am implementing a score system. When the players bullet hits the enemy, the player gains a point. The script for this is on the enemyCollision script. I check for when the 'playersProjectile' hits the enemy the player gains a point and it destroys the enemy gameObject. The score variable is in the playerControls script.

the code for the enemyCollsion looks like this:

 var playerScript : MoveAroundJS;
 function Start () 
 {
 
 }
 
 function Update () 
 {
 }
 
 function OnTriggerEnter(hit : Collider)
 {
     if(hit.gameObject.tag == "playerProjectile")
     {
         playerScript.enemiesKilled = playerScript.enemiesKilled + 1;
         Destroy(gameObject);
     }
 }

And heres a snippet from the playerControls script, showing the variable declared at the top and then the update function on how it's used.

 public var enemiesKilled : int = 0;
 
 enemiesKilled += 0;
     print(enemiesKilled);

I then drag and drop the player prefab on to the enemy prefab so that it gains access to the script. And then I place the player in the game. The problem I am getting is that the score is being placed on the prefab and not the in game character.

Since many hours of playing around I decided maybe it's best to spawn a player at the game start as a pose to placing it in the level. This means the prefab is in the game. However this gives the same problem.

Seriously can anyone help, I am extremely stuck and have no idea what's causing it.

On a side not, because the enemy has a bullet spawn point by it's gun, if the players projectile hits that, it adds two points instead of one.