I am using the same mega menu for desktop and mobile. The mega meny by itself works alright but when I use navigation inline it does not work on mobile phone. The nav inline sub-menues dissapear directly.
Link to page with not working submenues on mobile:
https://feminealab.se/feminealab-academy/halsotester-academy/
On desktop works alright. Other menues like layered menus works on mobile inside a mega menu. I think the inline should work since that is used in your own templates for mega menues.
Thanks for advice given