C# Windows Forms中解决教授精灵生成重叠问题的求助

我在开发C# Windows Forms游戏时遇到了一个问题：生成的教授精灵（用PictureBox实现）会互相重叠，实际运行截图显示本应生成的5个敌方角色出现了重叠情况。尝试过多种方案仍未解决，恳请提供帮助。

相关代码如下：

private void MakeProf()
{
    PictureBox prof = new PictureBox();
    prof.Tag = "prof";
    prof.Image = Image.FromFile("pdown.png"); //picture of the prof facing down (pdown.png)
    prof.Left = randNum.Next(0, 1400); //how far the prof will spawn
    prof.Top = randNum.Next(0, 800);
    prof.Size = new Size(110, 110); //size of the prof
    prof.SizeMode = PictureBoxSizeMode.Zoom;
    profList.Add(prof);
    this.Controls.Add(prof);
    player.BringToFront(); //overlaps the player
}

截图：

内容的提问来源于stack exchange，提问作者Jay Delos Santos