Sticky Nav not showing in mobile views?

Hi there,
my sticky navigation bar is working fine on the default and tablet views but completely disappears on both the mobile portrait and landscape views- and i cant work out why! i followed this tutorial to set up my sticky navigation, seems to work fine apart from this!
Is there some rule that i dont know about which restricts the nav in mobile view?

sorry, i’m a bit of a newbie, any help much appreciated!

Choose your nav bar style and go to “Settings”, look at “Visible on:” section and click all devices like on the screen

Give us a link to your published website and the torubleshooting link (it can be found in site settings)