Problem on attributes

Basically i have the product data and am trying to add some attributes such as numbers in he values bar eg 250 500 1000 2000 .. 5000. the problem i am facing is that i can put them in order going from lowest to highest, however when i look on the website and go to this certain drop down box the numbers are not in order with 3000 and 4000 coming before the rest. ive gone back and changed them; updated the site and still the numbers re adjust themselves out of order. anyone know how to keep them from changing order?