Menu dropdown dissapears

Hello kids!
I have a website running wordpress> http://tamborybajo.org

The main menu, has some sub menu options (Audio menu and software for example)

If you put the mouse on any of those options, the submenu goes behind the next (orange) section)

I already modified the z index, did several tests and nothing.

How to I make the submenu appear on top of the orange section?

Thanks a lot