Output voltage problem.(AD5625R)

Hi,
I want to control the output with I2C.
The pin settings are as follows:
LDAC = Low, CLR = High, POR = Low, VDD = 5V
After writing 0x01 to the 0x38(internal reference on) register, Ref Voltage(2.5V) is output.
However, 4V is output from VoutA,B,C,D.(Gradually rise from 1.8 V)
Only the reference voltage has been set.
Even if the output voltage value is set to the 0x1F command, 4V is still output.
What could be the problem?

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