Admin bar logo position

A tiny issue but I just can’t figure it out – I added a 16x16px logo to the admin bar under the Branding settings which displays just fine when logged in to the dashboard. However when I view the site (still logged in as admin) the logo displays flush with the top of the admin bar. Still centered in the 28×28 span, but has shifted up 6px. Like I said – a tiny issue but it’s bugging me!

https://www.ads-software.com/plugins/white-label-cms/