winform的datagridview加了一列checkbox设定了pading,但是发现滚动条移动后选中一个checkbox那个cell有时候会显示出2个checkbox，谁知道这是为什么？

        void SetGridViewStyle()
        {            dataGridView1.Columns[1].DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleLeft;
            int rightZeroCounts, firstNotZeroNum, padCount;
            foreach (DataGridViewRow dgvr in dataGridView1.Rows)
            {
                rightZeroCounts = GetRightZeroCounts(CommonFunc.GetDbInt(dgvr.Cells[0].Value), out firstNotZeroNum);
                if (rightZeroCounts == 2) padCount = 50;
                else if (rightZeroCounts == 3) padCount = 30;
                else padCount = 70;
                Padding pad = new Padding(padCount, 0, 0, 0);
                dgvr.Cells[1].Style.Padding = pad;
            }
            dataGridView1.Columns[3].DefaultCellStyle.BackColor = Color.AliceBlue;
        }