Aspose is not calculating the array formulas properly. I have attached a sample xls file. Column I has the Array Formulas. These are getting calculated properly in excel, but fails when Workbook.Calculateformulas is used.
I have tested your issue with your template file and found the issue. The formulas are not calculated fine for some array formulas in I6, I7, I8 cells etc.
I have logged an issue with an id: CELLSNET-27950. We will look into your issue soon.
We have fixed this issue. Please download Aspose.Cells for .NET v18.104.22.168.