It seems your problem is related to the sizing of OLE object that are generated by Aspose.Cells.
Aspose.Cells has a method namely SetOletSize(), I have used it to size it properly in the code , you can find in this thread.
http://www.aspose.com/community/forums/121497/how-to-access-ppt-chart-using-aspose/showthread.aspx#121497
Please get it from the attachment.
http://www.aspose.com/community/forums/121497/postattachment.aspx
Many Thanks and Kind Regards,
Shakeel Faiz
Support Developer
Aspose Sialkot Team
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