Quiz time: What's wrong with this picture of iPhones?

[deckeda]

sekker wrote:
[spoiler=My answer below.]
They are all iPhone5 models, the middle is a straight iPhone5 but is shown smaller than the iPhone5S and 5C behind it.
[/spoiler]

And we have a winnah! It was probably intended to represent the 4/4S but the person creating the composite image got lazy and shrunk down a 5 instead.