Thanks for your posting and considering Aspose.Cells.
Please provide us your source/output xls/xlsx files and the code replicating the problem. We will look into it and provide you a fix or advise.
Please also download and try the latest version:
Aspose.Cells for .NET (Latest Version)
My request is more of a feature request than a bug report.
Please use WorkbookSetting.ReCalculateOnOpen