Thanks for your request. Please attach your document for testing.
Als please make sure you are using the latest versions of Aspose.Words and Aspose.Pdf. You can download the latest versions from here:
Also note, the latest version of Aspose.Words supports direct conversion to PDF (Without using Aspose.Pdf). You can try using this method in your project. Please see the following link to learn more:
Thanks. Problem solved.