BQ27510 abnormal RemainingCapacity working

I test NCR18650PF battery and EVM27510-G3. Load with 550 mA to -30°C to check capacity of the battery and BQ2750 information.

RemainingCapacity register falls from 302 to 0 with batterie volatge = 2.949V and Nominal Available Capacity = 2256 mAh. 

Why ? 

 

Another case 50 minutes later, same battery, same evaluation board, current, always -30°C = -550mA : fall of  Nominal Available Capacity from 2309 to 1799 mAh, and in same time StateOfCharge True register pass from 0% to 42% :

Is it normal ? 

How can i have good information without jump ? bad settings in BQ2750 ?

Please, i need help to understand !