Hi Mikhail,
Greetings from Syncfusion.
When IWorksheet.EnableSheetCalculations() method is invoked, only the CalcEngine and required instances are created. The actual formula calculation starts only when you access the DispalyText or CalculatedValue property of the cell.
We request you to share the Excel document used at your end, with data filled using Template Marker. This will be helpful for us to validate further to find the root cause of the issue from our side and provide prompt solution at the earliest.
Regards,
Mohan.