Hi there: Double check a few things first. Go up to Setup, Settings, Payroll, Incomes. this is where all the choices are listed. Make sure that O/T is ticked off. Then go back to Payroll, Linked Accounts, Incomes. Make sure that the appropriate linked account is beside the O/T line that you will be choosing to use.
Next, go back to the Employees window. Pick each employee and in the Income tab put a tick mark in the "Use" column for the O/T line that you will be using. Enter the appropriate rate of pay for each employee. See if this fixes things. Rita Deering