ADG918 high video leakage when using DC bias

is there a change in video leakage with or without applying 0.5V DC bias?

I measured and saw a difference:

without bias: 2mV pk-pk

with bias: 300 mV pk-pk

the bias was applied using a 1.5V battery with voltage divider of 100 ohm and 200 ohm to achieve 0.5V bias. I used battery to have cleanest possible power supply.

I require the video leakage to be 2mV also with DC bias. is there any reason why I didn't get that?

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