BQ28Z620: BQ28Z620, when pack is rest, and set deadband current=3mA, GG current reading still is -1mA, that is no load current in picture

Part Number: BQ28Z620
Other Parts Discussed in Thread: BQSTUDIO

Tool/software:

BQ28Z620, when pack is rest, and set deadband current=3mA, GG current reading still is -1mA, that is "no load current" in picture, using FW100 version, if it has a bug? what is the problem, and I found this PACK's max error is huge, is it a related issue?