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LM5175: when Vin=Vout, how will LM5175 adjust? Why Inductance has abnormal noise?

Part Number: LM5175

Hi Team,

My customer now use LM5175 to output 12V.

When Vin=12V,which means Vin=Vout, customer found that output is pulled down  (nearly 0V) and Inductance has abnormal noise.

When Vin improved to 17V, the output is normal.

May I ask when Vin=Vout, how will LM5175 adjust? Why Inductance has abnormal noise?

Here are the SCH and PCB. SCH is almost the same as EVM and PCB has some difference.