HIQPdf html document to pdf is not working properly, Its printing in simple format.

// convert HTML to PDF
   byte[] pdfBuffer = null;
   try
   {

pdfBuffer = htmlToPdfConverter.ConvertHtmlToMemory(data, Request.Url.ToString());

        // inform the browser about the binary data format
        HttpContext.Current.Response.AddHeader("Content-Type", "application/pdf");

        // let the browser know how to open the PDF document
        HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment; filename=Report-" + globalFunctions.ConvertUTCToLocal(DateTime.UtcNow).ToShortDateString() + ".pdf");

        // write the PDF buffer to HTTP response
        HttpContext.Current.Response.BinaryWrite(pdfBuffer);