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Fault of Imon_Op (LT8708)

Category: Hardware
Product Number: LT8708

I designed battery charger circuit with LT8708. The circuit is working correctly. Imon_INN, Imon_INP and Imon_ON pins also work as described in the datasheet. I'm just having trouble with the Imon_OP pin.  Although my output current increases, the voltage value on imon_op pins doesn't change. So ı cant set current limiting on the output.  No problems with connection and soldering on the circuit. I dont know the cause of problem. I will be glad if you help. 

I measure the following values

Iout = 0.6 Amp , Vımon_op = 0.216 Volt     Rsense = 2m ohm     Rımon_op = 1.4 k 

Iout = 1.2 Amp , Vımon_op = 0.216 volt      Rsense =2m ohm     Rımon_op = 1.4 k