Control Sheets - Weeks Calculation
There are two ways in which you can configure how weeks in the month are calculated.
Actual = Weeks in a month
Average = Weeks in a year divided by 12
Go to Configure > Modules > Contracts Admin.
Scroll down to Control Sheets, Wages - Week Calculation.
Based on this setting the rates calculated will be updated.
Weeks Set to Actual
Weeks Set to Average