hmm... let's give it another try
I have a site that initially was in english only
I had to add arabic lang too
I reinstalled wordpress and activated the multsite option
I chosed the sub-directories option
The first site (id 1) is the english version with the path /
The second one(id 2) is the arabic version with the path /uae/
When I am on the english version/id1, in my custom navigation menu I have the page I've set as static page - front page which I've chosen from the box Pages to be added to menu as the first link in my menu along with all the other pages.
I save the menu, chose it as Primary Navigation and when I refresh the site, in front of my link/button for the above described home page it appears another link to the home page/static page/front page for my other subsite/id2/path /uae/.
If I look at the source code with the web developer addon for firefox there is only one "li" containing one "a href.." and no other sign of the other "li" or "a href..." which will lead to the other subsite
<nav id="access" role="navigation">
<ul id="menu-ar" class="menu"><li id="menu-item-364" class="menu-item menu-item-type-post_type menu-item-364"><a title="About us" href="h