winform绑定list泛型出现的奇怪问题

这个是为啥捏？
private void responseGetTableInfo(GetTableInfoResponseMsg getTableInfoResponseMsg)
        {
            dgv1.DataSource = getTableInfoResponseMsg.ChessResultBeans; //这里是绑定数据的。
            if (getTableInfoResponseMsg != null && getTableInfoResponseMsg.ChessResultBeans != null)
            { 
                //播放声音
                if (chkPlaySound.Checked && rdoOpen.Checked)
                {
                    if (soundPlayer == null)
                    {
                        soundPlayer = new SoundPlayer();
                        soundPlayer.SoundLocation = Application.StartupPath + "\\299.wav";
                        soundPlayer.Load();
                    }
                    soundPlayer.Play();
                }
            }          
        }