Lost focus / highlight on Navigation
If you visit the page example 'Portfolio', it has its highlight: https://www.diigo.com/item/image/6wmx/iyex
but once visit the item, it has no top high lighligh any more. Unlike the demo: http://themes.muffingroup.com/betheme/portfolio-item/portfolio-item-image
the highlight still remains showing where you are which is great.
What did I do wrong then?