Submenu dissappears on mobile

Hi,

Enjoying this clean theme. I have three items in a submenu. I made 2 under a parent and one by itself just to test. All three disappear on the mobile menu.

I don’t see where you set this up in the theme css. Can you help please. I don’t mind if they all apear as part of the normal drop down menu on mobile.

http://www.beginamindfullife.com/

Thank you