I'm unable to have the mobile version of my navigation bar (https://signup.circuitstream.com/essential) into a hamburger menu after following the steps on both of these pages:
Also, the same nav menu (global header group) is showing up on this test page on desktop, but not on mobile. It briefly appears when it loads, then immediately disappears.
Tried looking through the JS, CSS, headers and footers, as well as CSS declarations in the Design Manager.
Does anyone have other ides of where to look?