Hey all, I've been trying to sort Analytic accounts, but they are sorting in a strange way, unlike the other things.

For EG: I want to sort: 1, 2, 3, 4, 5, 10, 20.
But on Analytic accounts, by using References, it is sorting up as: 1, 10, 2, 20, 3, 4, 5.

Screenshot attached for more guidance: 

http://imgur.com/a/lmTa0

http://tinypic.com/r/153tc0z/9

Any help would be much appreciated. Many Thanks.