Navigation menu shifts around depending on type of page

For some reason the navigation menu shifts around to the side when I am on the main page (index), an article page or a posts page. My understanding was that the default.hbs file defined the look of the header for all of the different type of pages so I am confused why it is shifting around and how to get it to always look the same on each type of page.

And

  • How was Ghost installed and configured? Downloaded Casper template, made some tweaks and re-uploaded it.
  • What Node version, database, OS & browser are you using? Not sure about the first things but am running it in Windows/Brave browser
  • What errors or information do you see in the console? n/a
  • What steps could someone else take to reproduce the issue you’re having? Just check out the website link and click on “Home”, “About”, and “Getting Started” links at the top and you’ll see the navigation menu is always moving around a little bit.

Thanks,
Oliver