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TPS61021A: Duty cycle calculation of Boost converter

Part Number: TPS61021A

I have observed the difference in calculated and measured value of Duty cycle when Vin is 2.5V.Kindly find the attached excel file for more details.As output power is kept constant and Vin is increased from 2 to 2.5,duty is expected to reduce but it has increased,How can we describe this behavior of converter?Is there anything wrong in the  formulas used for calculating duty?duty of boost.xlsx