Is your field a text field?
I created a sample database and they sorted correctly when I selected the "by value list" option. Incidentally, sorting by this field in ascending order also produces the same result since the values you list are in alphabetical order.
man do I feel like a moron. I can't believe I didn't check that.
Originally when I designed this field a year ago it was a number field. Changes were made to the value list later, and ... oops. Thanks Phil!
Given how "loose" filemaker is with data types, this is a pretty easy one to trip over. :smileywink: