Header Display Issue [safari]

I have noticed that the header of my website is displaying incorrectly in Safari.

The search and social icons are wrapping onto a new line.

Here is a screenshot of Chrome vs Safari for comparison:

The issue does not resolve itself if I expand the window or make Safari fullscreen.

Details:

OSX Mojave 10.14.6
Chrome Version 81.0.4044.138 (Official Build) (64-bit)
Safari Version 12.1.2 (14607.3.9)

Please advise.

The page I need help with: [log in to see the link]