Navigation "menu" doesn't work as expected on mobile sites

Hi. Thanks for the continued awesome support.

The navigation menu works great for the "desktop" site, but the tablet and phone navigation versions is working unexpectedly. I had anticipated the menu would be accessible via the "horizontal line" icon and would need each section expanded. However when the menu is opened on the mobile site, all the sub menus are expanded.

How to I fix this?

thanks in advance!