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AFE4420: AFE4420 ADC Value

Part Number: AFE4420

Hi, 

    in my hardware, the PD's Anode connect to INP1 of AFE4420, and Cathode connect to INM1,  according to the description in AFE4420 datasheet, the ADC value shoud be negative:

    "If connecting the positive input pin to the PD anode and negative input pin to PD cathode, then the polarity of the ADC code corresponding to the PPG signal is negative"

    when I sample ambient noise, some times I got strange data like below:

    there are two big data -1048575 and -2097151, could you please help me analysis the problem?

RAW HEX CODE CONVERT DEC CODE
000003B1 -945
00000200 -512
000FFFFF -1048575
00FFFFFF 1
00FFFFFF 1

RAW HEX CODE CONVERT DEC CODE
0000020C -524
00000400 -1024
001FFFFF -2097151
00FFFFFF 1
00FFFFFF 1
00FFFFFF 1

thank you!