Reproduction Steps:

1. Create a new project
2. Create a milestone called "1. Design"
3. Create a milestone called "2. Develop"
4. View the original project's workboard

Expected Result:
The order of the columns should be "Backlog", "1. Design" then "2. Develop", either because of the milestone order, or because of the names of the milestones.

Actual Result:

Version Information:
phabricator: fd94e07aadf030653348d0db49b7b20700be7a5b
arcanist: 9b8c9d280ea47e7256dd1ac0ff17fe4aa363477e
libphutil: b4f38af384807b7dcd1e3d1a96e9e9069e4d6964