PDF merge issue

Hello,

We are having some issues wuth merging two documents, one is a pdf form that most likely causing some issues. The code is below. The intial files and result file are attached. The 456789-docs-merged.pdf is the final merged document.

 string _temporaryFilePath = @"Conversion";
            List<string> temporaryPdfFiles = new List<string>();
            List<string> temporaryFinalFiles = new List<string>();
            List<string> documentsTypes = new List<string>();
            string mergedDocFiles = string.Empty;
            string completedFile = string.Empty;
            string coverPageFileName = string.Empty;

            Aspose.Pdf.License pdfLicense = new Aspose.Pdf.License();
            pdfLicense.SetLicense(@"Aspose.Total.License.txt");

            Aspose.Pdf.Facades.PdfFileEditor pdfEditor = new Aspose.Pdf.Facades.PdfFileEditor();

            //return the documents types to list on the cover page later
            List<String> documents = new List<string>();

            documents.Add(@"MHCCAC_Intake_Form_2 4_test1.pdf");
            documents.Add(@"PDFDocumentSample.pdf");
            temporaryPdfFiles.AddRange(documents);

            // merge documents (in display order)
            mergedDocFiles = string.Format("{0}\\{1}-docs-merged.pdf", _temporaryFilePath, 123456789);

            //clean up, if the filename we are about to save exists, delete it
            if (File.Exists(mergedDocFiles))
                Oaccac.Dms.FileSystem.FileHelper.Delete(mergedDocFiles);

            //merge documents
            pdfEditor.Concatenate(temporaryPdfFiles.ToArray(), mergedDocFiles);