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TPS720-Q1: Load regulation-seems huge pls explain

Part Number: TPS720-Q1

Hi TI,

Please find the attached image. It is from TPS72028QDRVRQ1 datasheet. What my question is, why minimal current change huge voltage change is occurred?? ie,) If  output current changed to 1mA to 1.7mA means the voltage changed from 1.8V to 1.64V. This is very huge for this small current change. Is my understanding correct ??