Destroying Object after spawing - Vuforia

I am trying to destroy the image target and make my model independent after the target has been detected, but for some reason my target is being detected even when I am not showing camera anything.
I am using the following code:

 public void OnTrackableStateChanged(TrackableBehaviour.Status prevStatus, TrackableBehaviour.Status newStatus){
     if(newStatus == TrackableBehaviour.Status.DETECTED || newStatus == TrackableBehaviour.Status.TRACKED &&){
         OnTrackingFound();
     }
     else
     {
         if(!hasBeenDetected){
             OnTrackingLost();
         }
     }
 }

 private void OnTrackingFound()
 {
     Debug.Log("in OnTrackingFound()");
     hasBeenDetected = true;
     Renderer[] rendererComponents = GetComponentsInChildren<Renderer>(true);
     Collider[] colliderComponents = GetComponentsInChildren<Collider>(true);
     
     // Enable rendering:
     foreach (Renderer component in rendererComponents)
     {
         component.enabled = true;
     }
     
     // Enable colliders:
     foreach (Collider component in colliderComponents)
     {
         component.enabled = true;
     }
     Debug.Log("Trackable " + myTrackableBehaviour.TrackableName + " found");
     DestroyAndDetachChild();//My function
 }
 //I haven't changed OnTrackingLost()

 private void DestroyAndDetachChild(){
     Debug.Log("in DestroyAndDetachChild");
     gameObject.transform.DetachChildren();
     gameObject.setActive(false);
 }

Can someone tell me why is this behaving the way it is please?