Rouge article displaying on homepage - not listed in backend

I have Rockwall installed on Joomla 3. Then randomly the website displayed a rouge article from the built in 'Gavick Template Menu'. The article named Mobile UI Layout Design just popped up and will not go away.

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I have looked high and low. The article is not published anywhere, not linked, not in existence according to the back-end of Joomla. I also have the Template menu switched off. The article is also not listed in K2.

The article only displays when logged into the site as a Manager or above. The article does not display for normal Registered users.

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Any ideas how/why this rouge article is displaying on the home page?

The article is visible in NSP module or just on home page ?

The rouge article displays on the home page when all the NSP GK5 modules (except the top banner) are unpublished.

If I publish all the NSP GK5 modules the rouge article disappears. However then my featured "Hello, Great to see you" article will not display on the home page either.

I am still not entirely sure how to solve the problem. But I managed to create a work around to hide the rouge article.

I simply created a new Single Article menu link on the Main Menu and set it as the default. My featured article now loads up and no longer shows the rouge article.

Probably this are featured articles. Did you check your home menu item settings ? It is set to 'featued' articles ?