Hi!
These issues are usually related to some form of caching. If the nav-bar where you put the search code is the same on all pages, then it’s definitely a caching problem.
Also, many navigation bars are using different javascript events to trigger drop-downs and such, which may cause unexpected issues. Combining two javascript-driven elements requires programming knowledge, please keep that in mind.
Asking the theme or navigation menu author is also a good idea, as he most likely knows the best way to implement a shortcode directly into their navition menu.
If you have more information on this, I can try helping as much as I can with the placement, but I cannot promise to implement it for you, as it’s not part of the support process.
Best,Ernest Marcinko
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