The Paint method is being run multiple times, so it shouldn't be, why is that?

Question

C++ / C#

Hello

There is a panel1_Paint() method that runs several times when the program starts (4 times and then an error)

here is the code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace task3_cSharp
{
    public partial class Form1 : Form
    {

        public Form1()
        {
            InitializeComponent();
        }
        
        private const int CS_DROPSHADOW = 0x20000;
        protected override CreateParams CreateParams
        {
            get
            {
                 CreateParams cp = base.CreateParams;
                 cp.ClassStyle |= CS_DROPSHADOW;
                 return cp;
            }
        }


        private void Exit_Click(object sender, EventArgs e)
        {
            ActiveForm.Close();
        }

        private void Maximized_Click(object sender, EventArgs e)
        {
            if (WindowState == FormWindowState.Maximized) WindowState = FormWindowState.Normal;
            else WindowState = FormWindowState.Maximized;
        }

        private void Minimize_Click_1(object sender, EventArgs e)
        {
            WindowState = FormWindowState.Minimized;
        }

        
        private Point mouseOffset;
        private bool isMouseDown = false;
        private void ControlForm_MouseDown(object sender, MouseEventArgs e)
        {
            this.Capture = false;
            Message m = Message.Create(Handle, 0xa1, new IntPtr(2), IntPtr.Zero);
            WndProc(ref m);
        }

        private void Exit_MouseEnter(object sender, EventArgs e)
        {
            Exit.BackColor = Color.Red;

        }
        private void Exit_MouseLeave(object sender, EventArgs e)
        {
            Exit.BackColor = Color.FromArgb(53, 54, 58);
        }

        private void Paired_pictures_Draw(object sender, EventArgs e)
        {

        }

        private void Paired_pictures_Draw(object sender, PaintEventArgs e)
        {

        }


        Image[] img = new Image[]
        {
            Properties.Resources._1,
            Properties.Resources._2,
            Properties.Resources._3,
            Properties.Resources._4,
            Properties.Resources._5,
            Properties.Resources._6,
            Properties.Resources._7,
            Properties.Resources._8,
            Properties.Resources._9,
            Properties.Resources._10,
            Properties.Resources._11,
            Properties.Resources._12
        };
        //static int QuantityWidth = 4;
        //static int QuantityHeight = 4;
        int QuantityItem = 16;
        private void panel1_Paint(object sender, PaintEventArgs e)
        {
            Console.WriteLine($"{1}");

            Label l = new Label();
            PictureBox p1 = (PictureBox)game1.Controls[0];
            l.Text = p1.ToString();
            first.Controls.Add(p1);
            /*foreach (PictureBox p in game1.Controls)
            {
                // ...
            }*/
            for (int i = 0; i < QuantityItem/2; i++)
            {
                for (int j = 0; j < 2; j++)
                {
                    Random rand = new Random();
                    int r = rand.Next(0, QuantityItem);
                    //Console.WriteLine($"{i}");

                    setImg((PictureBox)game1.Controls[r], i);
                    //Console.WriteLine($"{r} {i}");
                }
            }
        }
        void setImg(PictureBox p, int id)
        {
            p.Image = img[id];
            //Console.WriteLine($"true");
        }
        private void Form1_Load(object sender, EventArgs e)
        {

        }
    }
}

The event itself has only one panel


Thanks in advance!)