Look at this site as example:
http://forums.411hype.com/
He changed "moderator" to "411's Moderators" so that all the dropdown boxes has the length of "411's Moderators".
If i check your forum then i c that the longest moderator is "bluegrassfootballfan", now change "moderator" to a title thats longer then that name and all the dropdown boxes are uniform in width.
Change "moderators" to "BluegrassPreps Moderators" and you will c what i mean