Help with nav links

Newbie here. I am having troubles with my mobile navbar. Works fine, but I added a new menu to the desktop menu and so I needed to create a new one for the mobile menu. I duplicated the nav link (to make it easier) and it does show in design mode, but not when I publish.
What I sort of see is that all the other nav menus in design mode are a block (height wise Image 1) but this new one is just skinny line (image 2) - is my nav menu height stopping it from being shown (image 3).

Any help would be great.
Thank you