no more menu on my mobile device

Good afternoon,

I do not think I changed anything in my set-up but it seems that since my update of Highend theme, my menu (the small horizontal bars) do not appear anymore on my mobile iOS device.

However, the menu is correctly set-up in French and English for mobile device and is the same as desktop version.

Desktop version is ok.

see http://www.alavise.com

Thank you for your support
Kind regards
Jean-Charles