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BQ25570: VBAT sine wave?

Part Number: BQ25570

Hi TI Team,

I refer to the design of BQ25570 EVM and my schematic is as follows.

I am applying 2.8V to VIN. I get 3.9V in VSTORE and only 1.2V in VBAT. And the waveform of VBAT looks like the figure below.

Is there anything wrong in my schematic? I am sure my soldering is correct. How can I solve it?

Thank you so much!