The magnetic field of Uranus is not a simple dipole field. It is a complex blend of dipole ("two poles") and quadrupole ("four poles") magnetic field elements.
This means that there must be at least two major electrical currents flowing on Uranus, and one way to explain this would be to assume a hollow planet model where there is a charged outer atmosphere moving in one direction and a charged inner atmosphere moving in a different direction.
The two charged atmospheres produce two magnetic fields that are partly in opposition to each other. Hence the complexity of the overall field.
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