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ADUM5411 VDD1 voltage out issue

Category: Hardware
Product Number: ADUM5411

I use the ADUM5411 for isolate 3.3V and 5V logic.
so I designed circuit as following :

I konw that the VDD1 is a voltage Input pin, but VDD1 is measured 4V.
3V3_MAIN is my board's main power, but it's voltage go up to 4V cause VDD1.

I know that VDD! is indpendent of VDDP as datasheet :

I don't know what's the problem??
I want to know if tthere is a any problem on my curcuit?

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