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BQ25892: bq25892 vsys drop at light load increase

Part Number: BQ25892

why does vout drop while Iload rises from 120mA to about 190mA? the charger is BQ25892, using a type A usb to power my system.

whn the system found a  device is connected to the board, a falling edge of CD trace will signal the mcu, and the mcu will pull high EN pin of ap2280 to connect the vsys to the power pin of the connect so the device connected to the board will startup. the board will draw about 70mA current from the vsys.

I wanna know why vsys will drop about at most 780 mV ?