OccupencyGrid Subsciber Could Only Get a quarter of map

[AlrayQiu]

when I forward a occupency Grid, I find that It only Recieve a Quarter Of All Map, Actually , the Origin Map is Compressed Into Quarters

Normally, the two pictures should be the same

right is the origin map and left is forwarded

there is the code

void CallBack(OccupancyGrid msg)
    {
        lock (lock_)
        {
            gridMsg.Data = new sbyte[(int)(msg.Info.Height * msg.Info.Width)];
            for (int i = 0; i < msg.Info.Width; i++)
                for (int j = 0; j < msg.Info.Height; j++)
                {
                    gridMsg.Data[i * msg.Info.Height + j] = msg.Data[i * msg.Info.Height + j];
                    Debug.DrawLine(new Vector3(i, 0, j), new Vector3(i, 0, j) + Vector3.forward * msg.Info.Resolution, new Color((msg.Data[i * msg.Info.Height + j] * 128) / 255.0f, 1 - (msg.Data[i * msg.Info.Height + j] * 128) / 255.0f, 0), 0.5f);
                }
            gridMsg.Info.Height = msg.Info.Height;
            gridMsg.Info.Width = msg.Info.Width;
            gridMsg.Info.Resolution = msg.Info.Resolution;
            gridMsg.Header = new Header() { Frame_id = Frameid };
            msg.Dispose();
        }
    }
    IEnumerator Publish()
    {
        while (true)
        {
            lock (lock_)
            {
                publisher.Publish(gridMsg);
            }
            yield return new WaitForEndOfFrame();
        }
    }

Env:

• Ubuntu22.04
• ros2 humble
• single pc