Help: My variable is always resetting to default value during play mode.

Questions & Answers
1

I have a simple script to keep track of a public HP variable and it also has a function Apply1Damage() that reduces HP by 1 everytime it is called. I also have a script which SendMessage() when a collision or a trigger is detected (OnTriggerEnter, OnCollisionEnter).
I have applied the HP script to my enemies object and it works perfectly. However, when I apply the same script to my player object, the HP variable keep resetting to the initial value at a very fast speed. Using Debug.Log, I see that my player is receiving the damage and that the health variable is being reduced, but never less than the initial value-1.
What could be causing this?

Here are the relevant scripts:

public class DamageableMonster : MonoBehaviour {

    public float health;
    Animator damageableObjectAnimator;

    void Start()
    {
        damageableObjectAnimator = GetComponent<Animator>();
    }

    void apply1Damage()
    {
        health--;
        Debug.Log("Health down to: " + health);
    }

	void Update () {
        if (health <= 0)
        {
            damageableObjectAnimator.SetTrigger("Death");
        }
	}
}

And

public class Apply1Damage : MonoBehaviour {

    public float knockback;
	// Use this for initialization
	void Start () {
        knockback = 1000;
	}

    void OnCollisionEnter2D(Collision2D other)
    {
        if (other.gameObject.layer != 8)
        {
            Debug.Log("HIT");
            float xDistance = (other.transform.position.x - gameObject.GetComponentInParent<Transform>().position.x);
            float yDistance = (other.transform.position.y - gameObject.GetComponentInParent<Transform>().position.y);
            other.collider.SendMessage("apply1Damage");
            other.rigidbody.AddForce(new Vector2(xDistance * knockback, yDistance * knockback));
        }
    }

    void OnTriggerEnter2D(Collider2D other)
    {
        if (other.gameObject.layer != 8)
        {
            Debug.Log("HIT");
            float xDistance = (other.transform.position.x - gameObject.GetComponentInParent<Transform>().position.x);
            float yDistance = (other.transform.position.y - gameObject.GetComponentInParent<Transform>().position.y);
            other.SendMessage("apply1Damage");
            other.GetComponent<Rigidbody2D>().AddForce(new Vector2(xDistance * knockback, yDistance * knockback));
        }
    }
	
}
2

if you are trying to decrease health when gameobject,layer 8 …!!!
then use like this

public class Apply1Damage : MonoBehaviour {

 void OnTriggerEnter2D(Collider2D other)
 {
    if (other.gameObject.layer ==8) 
     { 
       // if gameobject triggered with layer 8 it will work 
       other.SendMessage("apply1Damage");
      }
 }

//finds with name !!!

void OnTriggerEnter2D(Collider2D other)
{
if (other.gameObject.name==“Enemy”)
{
other.SendMessage(“apply1Damage”);
}
}

}

3

Check your scene to see if any object is colliding with your player.

Change

Debug.Log("HIT");

to

Debug.Log(name + " was HIT by " + other.name);

To find out what is colliding with your player. If may be the ground, an attached equipment item, etc.