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LT8641 FB voltage higher than 0.81V

Category: Hardware
Product Number: LT8641IUDC#PBF


I'm using the LT8641 to step down from 5V to 1.2V. 

My top feedback resistor is 392K, 0.1% and bottom feedback resistor is 806K, 0.1%. I am seeing 1.29V at the input and Vfb is 0.871V, as opposed to 0.81V. This is at no load. 

What could cause this to happen? 

Thank you