UCC24624: No drive waveform, from no load to full load

Part Number: UCC24624

Hi Tiers:
I'm using the UCC24624 in my 24V10A AC/DC power supply project,

but i find UCC24624 has a samll issue:

when the load change form no load(24V0A) to full load(24V10A), the SR controller UCC24624  VG1/2 don't have the driver waveform, and the power supply into the diode rectifier mode,

I have to restart the AC input,  UCC24624 can work properly,

below is the SCH, could you please give me some advice, thx

BTW:1.  I have a AUX, the VCC is normal.

2, the LLC controller is L6599, Can UCC24624 match with ST solutions?

I look forward to receiving your reply soon, thanks.