Not sure why the artist was automatically changed to "Various Artists". I suppose it's because of the two single entries and the one combination of the two.
It appears to me that this is an insert for a slimline jewel case and perhaps the smaller size was to allow the picture disc underneath to be partially exposed. Otherwise it would have been hidden by the insert. As for why this particular item didn't have the picture disc is anyone's guess, especially when the cover clearly states it does..