Well, there are two possibilities. Either you have that subforum set up incorrectly, or you've modified something that is breaking the style.
Does that forum have a parent set? What are your settings below for that forum?
Act as Forum
(Will act as category if no) Yes No
Forum is Active
(Will not appear if set to no, but remains accessible if the forum's URL is known) Yes No
Forum is Open
(Set this to 'No' to prevent any new posts being made in this forum) Yes No
Index New Posts in Search Engine
(Setting this to 'No' will prevent anyone from being able to search in this forum) Yes No
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