I think it is probably some sort of artefact. I don't think the view in the images on the right represents the view currently on offer from Earth.
below is an image i captured from 2016, it shows some of the Moons and some subtle lightening at the Polar region. The presence of the Moons helps in determining the orientation when captured, which also helps to decide if you have captured anything other than the disc.
The smaller image is from WimJupos, showing the view on the 8th. Your image to me does look at little out of shape maybe, the focus was off a little?
In my experience Uranus is a very tough target to get anything other than a disc, even my image below i wasn't 100% certain it was the Polar region.