I just started a new save and the UI is showing planets out of order.

If the image upload works you can see that the 3rd planet from the sun (Eneny) is showing as the outermost planet in the UI element at the bottom of the screen.
It appears to be purely cosmetic.
I don't know if this is reproduceable and nor do I know if it is happening in other systems in my save. Only just started the save.