The good news with bottom nav bars is that most people know after only a few hours of surfing the web to look at the bottom of a page for the nav bar. If the navigation bar runs down the left site of the page, it is immediately visible to users. However, rarely is the whole nav bar visible, and often a visitor is left scrolling up and down looking for the link they want. Keep the navigation bar in the same place on ALL pages. Once a visitor knows where your nav bar is located, don't confuse them by moving it around.
Some webmasters like to take the current page's link out of the navigation bar.
Either give the visitor a visible cue to let them know where they are, or leave the navigation bar alone. Don't play musical buttons. All links should have the same order on all pages. Anything else is confusing and frustrating. New navigation bar.