TPS61099: Unexpected high output voltage in a load variation test

Part Number: TPS61099

Dear TI engineer,

   I'm testing the board uses TPS610993 to boost  from alkaline battery voltage to 3.0V. 

   I found an unexpected high voltage in load variation test.    I think TPS610993 is fixed output (3.0V).

  What is happening in my board?

  I tested same test  with TPS61099EVA-023. No high voltage.  3.6V fixed type is mounted in TPS61099EVA-023 .

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