关于fpSpread水印

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使用下列代码添加水印，不冻结列则显示3列水印，冻结10列则水印直接飞到右侧了，就显示一半，为什么，怎样解决？

      private static void fpSpread_PrintBackground(object sender, FarPoint.Win.Spread.PrintBackgroundEventArgs e)
      {
         try
         {
            var text = $"2023 1111 为什么";
            var imgSize = e.SheetRectangle.Width / 3;
            var fontSize = 14;
            var font = new System.Drawing.Font("宋体", fontSize, System.Drawing.FontStyle.Bold);
            using (var img = new System.Drawing.Bitmap(imgSize, imgSize))
            {
                  using (var g = System.Drawing.Graphics.FromImage(img))
                  {
                     g.Clear(System.Drawing.Color.White);
                     //将原点移动到图片中点
                     g.TranslateTransform(fontSize, imgSize / 2);
                     //以原点为中心转 -45度
                     g.RotateTransform(-45);
                     g.DrawString(text, font, System.Drawing.Brushes.LightGray, 0, 0);
                     g.Save();
                  }
                  var pic = new FarPoint.Win.Picture(img, FarPoint.Win.RenderStyle.Tile);
                  pic.AlignHorz = FarPoint.Win.HorizontalAlignment.Distributed;
                  pic.AlignVert = FarPoint.Win.VerticalAlignment.Distributed;
                  pic.Paint(e.Graphics, e.SheetRectangle);
            }
         }
         catch (Exception ex)
         {

         }
      }