Task Board: Assignees not listed alphabetically

On the task board, when viewing summaries, there is the option to assign items. The list of assignees is not listed in alphabetical order - but it is close. This is confusing and hard to locate the correct assignee.

Example:
Alex Ad
Andrew Boy
Aus Gill
Alex Howe
Adam Rob

The names do list correctly in JIRA, so it appears to be specific to the Greenhopper plug-in.

Observed in Greenhopper v3.5.