I’m sorry for posting here but did you manage to find a solution? I have the similar problem so I hope you can help me
Please try the latest 20.8 version of Aspose.Words for .NET and see how it goes on your end? In case the problem still remains, please ZIP and upload your source Word document and Aspose.Words generated PDF file showing the undesired behavior here for testing. Please also create and attach a comparison screenshot (which highlights (encircles) the problematic areas in Aspose.Words 20.8 generated PDF ( with respect to Word document )) here for our reference. We will then investigate the issue on our end and provide you more information.