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Jump Problem

My character is jumping but sometimes it jumps like 1 cm and sometimes 4m how can I fix it, here is the movement script:

using System.Collections;

using System.Collections.Generic;

using UnityEngine;


public class PlayerMovement : MonoBehaviour 

{

    public CharacterController controller;


    public float speed = 12f;

    public float gravity = -9.81f;

    public float jumpHeight = 10f;

    

    public Transform groundCheck;

    public float groundDistance = 0.4f;

    public LayerMask  groundMask;       


    Vector3 velocity;

    bool isGrounded;

    

    // Update is called once per frame

    void Update () 

    {

        isGrounded = Physics.CheckSphere(groundCheck.position, groundDistance, groundMask);


        if(isGrounded && velocity.y < 0)

        {

            velocity.y = -2f;

        }


        float x = Input.GetAxis("Horizontal");

        float z = Input.GetAxis("Vertical");


        Vector3 move = transform.right * x + transform.forward * z;

        

        controller.Move(move * speed * Time.deltaTime);


        if(Input.GetButtonDown("Jump") && isGrounded)

        {

            velocity.y = Mathf.Sqrt(jumpHeight * -4f * gravity);

        }


        velocity.y += gravity * Time.deltaTime;


        controller.Move(velocity * Time.deltaTime);

    }

}

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