Search icon in top bar (+ symbol) disappears

Hey guys

I searched the forums but searching for the word search was tough but brought up no results.

I installed the Oria theme on 2 domains tonight after I realized sometime after the initial loading of the theme and set up the + to expand search popup had disappeared. When I setup again on a new domain clean I found out that whenever I change the default landing page to a static page from posts the + disappears.

I am guessing it’s a CSS bug but wondered if you had any suggestions I would appreciate it.
Your theme is amazing out of the box. so much about it is perfect. thank you!

Many thanks