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BQ25504: query about Application Curves

Part Number: BQ25504

Hello, I have a question.

I used an amorphous silicon solar panel AM5610.

When testing under direct halogen lamp, the cold start phase Vin is about 360mV.

In addition, yellow line is Vin_DC and green line is VBAT.

I want to know why the cold start voltage goes up until reaching to main boost mode. (3s ~ 5s)

It has to be constant until start sampling according to Figure 15. ‘Startup into Depleted Storage Element’ of BQ25504 datasheet.

I attach my measurement. Thank you!