Refer the below points on how to correct the processed data.
1: Please use the payslips edit option to make corrections.
https://paybooks.freshdesk.com/support/solutions/articles/4000066601-how-to-edit-payslip-
Example:Desgiantion/Department/processed salary etc.
Or
2: Unlock the payroll and re-process to make current in the current month pay data.
https://paybooks.freshdesk.com/support/solutions/articles/4000093080-how-to-unlock-payroll-
Example: Leave and Attendance/Pay adjustment/Income tax override etc.