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Some issue for LTC2928?

Dear Sir:

               We want to use LTC2928 in our product and we have some problem now and we tried to disable  voltage monitor (V1-V4) function and connect those pin to GND and we also disable PTMR and connect this pin to GND , Then we can measure high signal from FLT pin and it can measure 1.1V from ON pin , but There are only EN1 pin and EN4 pin turn on(6.5~7.5V) , then EN2 and EN3 still keep low , What's problem do we have? Does ADI has some suggest to us?   Below is our schematic for your reference ,  BTW Does ADI have LT spice model for LTC2928?Thanks.