When selecting forum moderators to specific forums, be sure not to including 'forum categories'. For some reason, if you assign them to a forum category on the updated boards, they will not show on the moderating team.
Edit your forums permissions for the moderating group, and deselect all categories & forums that act as categories as they cannot moderatorate either of the two because they're inactive. Once you do that, there shouldn't be an issue with your forum moderators showing up on the moderating team.