First - I’m looking again at your original shared link and it seems that if i click on each nav item, Home, Services, About, etc. that not all of them have the nav link class applied to them.
Second, once you apply that class to each nav item, try changing the color of the class to something else, then back to the Blue. It’s weird but that’s the only way I got the color to stick.
Additionally, once you get this working on one page, you should really convert it to a symbol and put that symbol on all pages rather than having a different Navbar on each page. Because, right now you would have to make edits on the nav bar on every page.
Hope that helps!
JFly