Output voltage offset error using ADA4350

I am using ADA4350 as a programmable gain AMP and a ADC driver for AD4003. However, in the simulations I found that there is a voltage offset at the FB0 pin and the SWA_OUT pin, about 18mV and 30mV respectively. What's the cause of these offsets and how could I remove them?

Thanks all in advance.

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