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; }