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Adum2250 VOL too high

Dear ADI

We are using Adum2250 for I2C isolation, the VDD1 and VDD2 are all 3.3V.

We input SDA from SDA2 , use internal pull up resistor, output to SDA, the VIL to SDA2 is SDA2 < 0.4V, , the

VOH from SDA1 is 0.8V < SDA1 < 0.7V . 

Why VOH higher than VIL so much ? How can we reduce VOH ?