Numeric Attributes values in drop-down list based on Excel Lists seem incorrectly sorted. In fact, they are sorted alphabetically instead of ascending numerically.
Symptoms
Numeric values in the Attribute drop-down are sorted alphabetically instead of ascending numerically.
For example: 1 10 11 2 3 4 5 6 7 8 9.
Workaround
To ensure the numbers are sorted numerically, add a leading zero to the single digit numbers (or as required).