Yep, this is an unreverted template. Your site is not loading the JavaScript file clientscript/special_reset.js (you can see that FireFox's Error Console mentions vB_ResetHandle.
What must have happened is that an edit was made to the template vault_article_main by clicking it in the "Unreverted templates" list, so vBulletin assumed that the edit brought it up to date.
The fact is, however, that this template still needs to be reverted. You can do this by searching for vault_article_main in your forum's Style Manager and clicking the revert button there.