Sticky bar on mobile unreasonably tall

Hello everyone,

I’ve utilised Unbounce’s Sticky Bar, and I’ve kept it’s height relatively short (30 pixels).

It works fine in Desktop, but on Mobile, somehow it’s much thicker/taller, for no obvious reason (to me).

I’ve double-checked by editing the Sticky Bar, and checking both Desktop and Mobile views that I haven’t got the height wrong.

Landing Page in question is here ->

Any advice? Is something causing it to be double the height I specified?