Can you please share that either you are using the Legacy/Conventional method (using Aspose.Words and Aspose.Pdf to convert the Word document into PDF format) or using the new Direct-to-PDF save method of Aspose.Words to accomplish your requirements ?
As per my observations, when I have tried converting the word document into PDF format using Direct-to-PDF save method with Aspose.Words 9.1.0, I am unable to notice any problem. The resultant PDF that I have generated is in attachment. Please take a look.