@Akbar_LP Could you please attach your input MS Word document and output PDF here for our reference? We will check the issue and provide you more information. Unfortunately, it is impossible to analyze the issue using screenshots.
The problem might occur because the fonts used in your input document are not available on the machine where document is converted to PDF. If Aspose.Words cannot find the font used in the document, the font is substituted. This might lead into fonts mismatch and document layout differences due to the different fonts metrics. You can implement IWarningCallback to get notifications when font substitution is performed.
Please see our documentation to lean where Aspose.Words looks for fonts:
https://docs.aspose.com/words/net/specifying-truetype-fonts-location/