值没有始终递增，请帮助。描述如下。

using UnityEngine;
using UnityEngine.UI;
using System.Collections;

public class parryreact : MonoBehaviour
{
    public Animator anim;
    public StanceMeter tired;
    public HealthBarForPlayer heal;
    public bool canAdd = true;
    public bool immune = false;

    // Start is called before the first frame update
    void Start()
    {

    }

    // Update is called once per frame
    void Update()
    {

    }

    void OnTriggerEnter2D(Collider2D other)
    {
        if (other.tag == "smallparry" && canAdd)
        {
            // 不响应的部分，请删除注释
            anim.Play("feedback", 0, 0f);

            tired = other.gameObject.GetComponent<StanceMeter>();
            tired.stance += 10;

            canAdd = false;
        }
        else
        {

        }
    }

    void OnTriggerExit2D(Collider2D other)
    {
        canAdd = true;
    }
}