Special character is shown when converting form word to PDF

We are using aspose.word version 13 to convert word to PDF. we have a new change to update the word to add new text. when deploying and using the service again we got a special characters for non- English text like small square with x inside. when undoing the change from the word the PDF is converted normally. the question and the issue is when open the existing word and update the content and save and close it. appreciate your help .

@AOuda

Please share your sample code along with the input Word document with us. We will investigate the issue and will guide you.

GovtClaims.zip (93.5 KB)
conversion.PNG (21.2 KB)

note that the document content is filled by hosted service. attached the document before conversion. GovtClaims__20210104095981.zip (93.9 KB)

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