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ADM2653E power-up problem

I'm a DFAE in Japan.

My customer reported me that VISO output does NOT power up correctly, when he set VISO output to 3.3V and supply 5V to VCC.

he said VISO output power up correctly in the case that he set VISO output to 3.3V and supply 3.3V to VCC and in the case that

he set VISO output to 5V and supply 5V to VCC.

I attached scope shot when VISO output does NOT power up.

the circuit is the identical to the evaluation board.

What is the cause of the problem?

ADM2563E