Answer:
The emissions (EMI) are coming from MAX14001/MAX14002. The component has internal digital isolator which oscillates at those frequencies. This is a common behavior, but we haven't reported it. One of the ways of reducing the radiation could be using external shielding.
We have similar devices in our portfolio (ADE1201 and ADE1202) and they also have internal digital isolators which have emissions in hundreds of MHz range, but we didn't measure their level.
The article below also covers EMI mitigation techniques extensively-
AN-0971: Recommendations for Control of Radiated Emissions with isoPower Devices | Analog Devices