Why does DevExpress Report only display one row despite multi-row data source?

I am working with DevExpress v24.1 in a C# Windows Forms application. I am facing an issue where my DevExpress report only displays a single row of data, even though the assigned data source contains multiple rows.

I suspect the problem is related to the report's structure or data source configuration, but I am unsure of the exact cause.

What could be causing this, and how can I resolve it?

Design of the DevExpress Report is shown here:

enter image description here

Data source sample for my data:

[
  {
    "CardNo": "C001",
    "CarNo": "CAR-101",
    "DriverName": "Ali Hassan",
    "FileNo": "123456",
    "CreatedDate": "2025-11-22T04:57:24.137",
    "AmountViolations": 1000.00
  },
  {
    "CardNo": "C002",
    "CarNo": "CAR-102",
    "DriverName": "Mohamed Youssef",
    "FileNo": "123456",
    "CreatedDate": "2025-11-22T04:57:29.183",
    "AmountViolations": 1000.00
  },
  {
    "CardNo": "C003",
    "CarNo": "CAR-103",
    "DriverName": "Ahmed Ibrahim",
    "FileNo": "123456",
    "CreatedDate": "2025-11-22T04:57:31.36",
    "AmountViolations": 1000.00
  }
]

My code:

private async void BtnPrint_Click(object sender, EventArgs e)
{
    var ReportDataSource = await GetCarsOrgs();

    XtraReport rptOrgCars = new XtraReport();
    rptOrgCars.LoadLayout($@"{Application.StartupPath}\Reports\rptCarsOrg.repx");
    rptOrgCars.DataSource = ReportDataSource.ToList();
    rptOrgCars.ShowPreviewDialog();
}

public async Task<IEnumerable<CarOrgsReport>> GetCarOrgsReport(string CardNo,string CarNo)
{
    var query = from ca in _uow.repOrgCars.Table
                    join c in _uow.repCars.Table on ca.CardNo equals c.CardNo into carsOrgs
                    from c in carsOrgs.DefaultIfEmpty()
                    where   (CarNo == null || c.CarNo == CarNo) && (CardNo == null || c.CardNo == CardNo)
                    select new CarOrgsReport() { CardNo = ca.CardNo, CarNo = c == null ? string.Empty : c.CarNo, DriverName = c.DriverName, CreatedDate = ca.CreationDate, AmountViolations = ca.AmountViolations, FileNo = ca.FileNo };
    var Result = await Task.Run(() => query.ToList());

    // foreach (var result in Result)
    //    result.Duration = result.SourceActionDate == null || result.TargetActionDate == null ? string.Empty : result.TargetActionDate.Value.Subtract(result.SourceActionDate.Value).ToString(@"dd\:hh\:mm\:ss");

    return Result;
}