Random Ordering of Users

My list of users keeps reverting back to random order instead of what I put into the UserList.class.php file and also what I put into the shortcode.

in the file I have:

/**

	 * The order which the users are shown in.

	 */

	var $order = 'last_name';

	/**

	 * The direction which the users are sorted in.

	 * Possible values: 'ascending' / 'asc' or 'descending' / 'desc'.

	 */

	var $sort_direction = 'ascending';

	/**

and in my shortcode I have:

[authoravatars roles=contributor avatar_size=200 show_name=true show_biography=true show_position=true show_email=true show_phone=true show_office=true order=last_name sort_direction=asc]

[Moderator Note: Please post code & markup between backticks or use the code button. Your posted code may now have been permanently damaged by the forum’s parser.]

Any idea of why it keeps reverting back to random?

quick side note…I added a few more variables to show up for each user.

http://ww.wp.xz.cn/plugins/author-avatars/