Not a big deal, but the icon for Overlord is bigger than for the others. Not sure if the problem is at GOG's side or with GOGWIki.
Same (98x98 icon) for Another World: 20th Anniversary Edition, Don't Starve, Eador. Masters of the Broken World, FEZ, Overlord + Raising Hell, ...
GOG scales all icons in the [wish]list to the old size (49x49).