Help with my <nav>

Question

I dont understand why nav is not position fixed, when I click on link History and then Prehistory :) why on that "page" nav is not fixed :)

https://code.sololearn.com/WDIVNTdjDrP0/?ref=app

Answer 1

you can't see it in mobile app, only in browser dev kit

Answer 2

oh, I found it. You copied code from external website and there is a lot of &nbsp spaces

Answer 3

here is printscreen if you don't belive me :
http://prntscr.com/f7smcp

Answer 4

i dont know why but if put br tag everything is become fine

... Praevalitana, <br>Dalmatia, Dacia and Macedonia...

Answer 5

Where you saw those spaces &nbsp?

Answer 6

aha yeah, I see it now ;) tnx mate :)