Thanks for the detailed information.
I have identified the cause of this issue. It’s because exported data in Excel file is using round-half-up method, which is causing the inconsistency with payslip result.
To resolve this issue, I have decided to change existing rounding method to round-half-up method too, so that the final results between payslips and exported Excel data will be consistent: Rounding Method Used for Payroll Calculation
You may check your result to confirm.