Problem with the primary menu

Hello.
I don’t know what happened, but my primary menu is not showing correctly. Do you have any idea how can i fix it?
Website: http://www.encualquierviaje.com/
Thank you very much…

Want to add some space between menu items? if yes, please try to add this CSS code:

#mainnav ul li {
    padding: 0 10px;
}

Regards,
Awan

Thank you very much!!!