Shot targets (FindGameObjectWithTag) don't add to "Total Targets Shot" float?

Okay so in order to get this to work I've been adding variable upon variable upon variable... obviously this does nothing unless implemented correctly. The scenario: six targets lined up in a shooting range. If a gameobject with the tag "Bullet" enters one of their BoxColliders, then the script is supposed to add one point (1) to the TargetsShot float, and then send that number to the GUI text. It sends the text alright, that's no problem. BUT: when I shoot a target with the bullet tagged as "Bullet", it does not add 1. In some cases, it adds something like .2, and once all of the targets are shot, it finally ends up being "Targets Shot: 1/6". Something with my math is wrong, and I'm trying to figure out what's happening. Also, it has a hard time detecting all of the bullets at once, so if I shoot a spread of say 6 bullets, it only knows about one of them. BTW, the "1" in "1/6" never goes higher than that.

The animation script for a shot target also deactivates the BoxColliders, preventing glitches after they're shot (like continuing to play the animation by shooting it). I used this fact as a boolean. If the boxcollider is deactivated, then add one point. Pretty simple right? Nope.

These are literal targets that fall over when you shoot them. So why isn't the script doing its job?

Really sorry about the mess.. I was experimenting with different variables. If a variable doesn't seem like it does anything for the script, then just ignore it...

Can anyone think of any alternative to using the Box Collider to do what I want?

My code:

     #pragma strict
     
     var SoundLocation : GameObject;//3D Location of the 3D sound effect
     var Bullet; //The GameObject tagged "Bullet"... not really implemented
     var TargetAnim : String = "TargetShot"; //The animation for the Target.
     var pickup : AudioClip;//Sound after a Target has been shot
     var TargetShot : boolean = false; // If a Bullet with the tag "Bullet" enteres the    //BoxColider, then TargetShot = true.
     var TargetGUI : GUIText; //Area where the text shows up
     var Target : GameObject; //The target itself
     var Targets : float = 6; //How many targets are in the scene
     var AddCount : boolean = false; //Experimental
     var TargetCounter : int = 1; //How many to had to the TargetsDown
     var TargetsDown : float = 0; /How many targets have been shot
     
     function Update () { //made to keep the GUI in one place, weird glitches in past.
     
         TargetGUI.guiText.pixelOffset = Vector2 (Screen.width * -0.49, Screen.height - Screen.height / 0.78);
     
     }
     
     function OnTriggerEnter(other : Collider) { //If the tag = Bullet...
     
         if(gameObject.GetComponent(BoxCollider).enabled == false) { //If the BoxCol. is deactivated, then add one point to TargetsDown
             TargetsDown += TargetCounter;
         }
         
         if(other.tag == "Bullet") { //If the tag = "Bullet", then initiate animation
             TargetShot = true;
         }
         
         if(TargetShot == true) { //Animation and BoxCollider deactivation
         gameObject.animation.Play(TargetAnim);
         AudioSource.PlayClipAtPoint(pickup, SoundLocation.transform.position, 8);
         gameObject.GetComponent(BoxCollider).enabled = false;
         }
     }
     
     function OnGUI() {
     
         TargetGUI.text = "Targets Hit: " + TargetsDown + " / " +  Targets.ToString(); 
         TargetGUI.guiText.pixelOffset = Vector2 (Screen.width * -0.49, Screen.height - Screen.height / 0.78);
     }
 
 EDIT:

Also, when I step inside the collider of a target, it acts like I'M the "Bullet"... not sure what's wrong.