Dropdown Menu

I am working on a child theme of Pinboard, unfortunately not made by me and a little bit advanced for my skills. I am a designer with a good knowledge of CSS and just basic programming.
I’ve made a backup of everything to update the theme and WP versions, after that the home page menu stop working, it is also working on all other pages of the site.

Any hint?

http://www.lucimara.net/

Thanks in advance.