CMS Sub-nav disappeared after opening an article
 

Hi,

There is a glitch on my CMS. When open an article to view, the sub-nav disappeared. (please view below pic, or visit my site to check. )
Attachment 44094
But when I view sections, the sub-nav is normally shown.(please view below pic)
Attachment 44095
I had tried to solve it many times, but failed . So, how can I solve it?
Thanks in advance.

vicelover
Attached Images

• http://vb.ma7room.com/jpg.gif sub-nav-2..jpg‎ (59.1 KB)
• http://vb.ma7room.com/jpg.gif sub-nav-1..jpg‎ (45.5 KB)