How are you calling the breadcrumb trail (e.g. are you using the included Widget, or are you calling bcn_display()? I ask as what you are describing is not something Breadcrumb NavXT is doing by itself (something is calling it in two different locations for some reason).
Hi,
I’m not using widget to display breadcrumb.
I have activate plugin only and display two bradcrumb only in products page http://demo.villadevarda.com/grappe-trentine/gran-cru/grappa-riserva-amarone/
I need only one bradcrumb on top page. I don’t know how to remove it from bottom.
This is very likely something your theme is doing then. Either it is calling bcn_display() multiple times on a page, or it is applying the tha_breadcrumb_navigation filter more than once (or doing both, which it should not be doing). Your best bet is to find where the theme is calling Breadcrumb NavXT and make your own version of that file in your child theme, ensuring only Breadcrumb NavXT is called once and where you want it to show up.