C# - empty half table rows after converting HTML to PDF using itextsharp

//HTML Construction
string html = @"HTML STRING COMES HERE";
using (var memoryStream = new MemoryStream())
{
    Document document = new Document(PageSize.LETTER, 15, 15, 20, 30);
    document.SetPageSize(iTextSharp.text.PageSize.A4.Rotate());

    //var document = new Document(PageSize.A4, 50, 50, 60, 60);
    var writer = PdfWriter.GetInstance(document, memoryStream);
    document.Open();

    using (var cssMemoryStream = new MemoryStream(System.Text.Encoding.UTF8.GetBytes(Constants.CssText)))
    {
        using (var htmlMemoryStream = new MemoryStream(System.Text.Encoding.UTF8.GetBytes(html)))
        {
            XMLWorkerHelper.GetInstance().ParseXHtml(writer, document, htmlMemoryStream, cssMemoryStream);
        }
    }

    document.Close();

    pdf = memoryStream.ToArray();
    return pdf;