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LM5176: instability of PWM

Part Number: LM5176

Hi team,

my customer discover some  problem under 24 to 20V step down conversion

the load is 5A.

channel 1 is vout, channel 3 is SW,

you can see the PWM doesn't follow FCCM behavior,

May I know is this slope compensation problem or something else?

  

below is the schematic, they basically follow this file EPR_EVME3(001)_Sch_Dell.PDF

I try webench to emulate it but the phase margin looks fine, so weird...