Overtime is calculated based on the start of the workweek (Settings --> Overtime), so if the start of your pay period does not match the start of your work week there can be overtime from a prior pay period.
Also, each employee has their own specific overtime rule. This can be set under the employee's profile (Employees --> View --> Edit).
If you are confused on a calculation, please ask! We can help explain how or why overtime was calculated.
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