iTunes Artist Name arranging

My iTunes for some reason, has put the artists whos name begins with a number (2 many djs and 50 cent for example) at the bottom of the list after X,Y,Z artists, whereas for 8 months they've sat at the top before A,B,C etc.

The only thing I can think of what has caused it is updating iTunes. :-s

Has anyone else had this problem and knows how to fix it?!

It was change in either 7.2 or 7.3. It was mentioned somewhere around here in a thread.