Thank you for sharing the image files.
However, I am not very clear about your requirement. As you are using a very old version of the API, I would suggest you to download and try the latest version of Aspose.Slides for .NET and check if it works fine for creating charts at your end. If you still face the issue, please share your input, output files and sample code / application with us to further test the issue.
Thanks & Regards,