DRV8718-Q1: short-circuit

Tool/software:

Hi team，

Could you help on below questions and give some suggestions? Many thanks.

We meet a confusing issue on short-circuit for DRV8718SQRVJRQ1.

 Here is the protective value we set : Vds=0.2V , Ron_MOS=4.8mR , Vds_DG=4us，Vgs_DRV=24us;

If we only open one of these channels ,  then short the CDC_HS_FL/RL/RR/FR to the GND, the chip reports over-current fault rightly. 

If we open all four channels and set 0.6A current. Shorting the RL/FR/RR to GND , it also reports faults rightly . However , when it comes to CDC_HS_FL(DRAIN-SH1) , the chip generates RL and FL over-current wrongly. We'd like to know is there any coupled connection  between FL and RL (DRAIN-SH1 and  DRAIN-SH5) ?

Regards,

Ivy