sort 2.0a

Hello,
with -n, the result is incorrect.

example :
file = 1 5 3 55 11 33

sort -n file
result :
1 33 3 5 11 55

good result is :
1 3 5 11 33 55

Do you have a solution for a correct result ?

Sorry for my english, i am french -:)

Bye.

Laidet Sébastien.