Why is my vertical movement faster than my horizontal?

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My PlayerController.cs code:

using UnityEngine;

[RequireComponent(typeof(Rigidbody2D))]
public class PlayerController : MonoBehaviour
{
    Rigidbody2D rb2d;
    bool isMoving;

    public float moveSpeed = 500f;

    private void Start()
    {
        rb2d = this.gameObject.GetComponent<Rigidbody2D>();
    }

    public void Move()
    {
        float moveX = 0;
        float moveY = 0;

        // Only let player moves when they are not moving
        if (isMoving == false)
        {
            moveX = Input.GetAxisRaw("Horizontal");
            moveY = Input.GetAxisRaw("Vertical");
        }

        if (moveX != 0 && moveY != 0)
        {
            // If player tries to move diagonally, return nothing
            return;
        }

        if (moveX != 0 || moveY != 0)
        {
            Vector2 moveVelocity = new Vector2(moveX, moveY).normalized * (Time.deltaTime * moveSpeed);
            rb2d.velocity += moveVelocity;
            Debug.Log(rb2d.velocity);
            isMoving = true;
        }

        if (rb2d.velocity.x == 0 && rb2d.velocity.x == 0)
        {
            isMoving = false;
        }
    }
}

change the last if you are only compary the x velocity no the y so when you add the Y velocity isMoving is always false

     if (rb2d.velocity.x == 0 && rb2d.velocity.y == 0)
     {
         isMoving = false;
     }