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MSP430F67641: The error of large current

Part Number: MSP430F67641
Other Parts Discussed in Thread: EVM430-F67641, MSP430F449,
Hello:
     I have a question and need some help about the chip of msp430f67641,   The meter specification is 10(100)A,    const is 500 k
     
     When the meter power on with large current (USE  60A  TEST),   the meter start with a big error show about -11.234%,  and  later change to -0.197%,   and last change to 0.083%(Stable) (watch big current.mp4)
     When the meter power on with small current (USE 10A TEST),  the meter runs Stable with error 0.08 % ~  0.09%。  (small current.mp4)
    I have test many meters use Metering chip, and not no problem of large current start。   So  how can I solve the large current  start error of 67641 ?   Thanks!