Hello, I'm on a 2011 13" i5 macbook air! (by far the best computer I ever have had btw). But there's something strange...if I open the "about this mac" window I get that my macbook air is actually a macbook pro!

is this a bug everybody is having or am I the only one?
See the screeshot:
is this a bug everybody is having or am I the only one?
See the screeshot: