Are You sure its working like it should with this code?

[bkt1916]

Hi, all files are exactly the same. Im checking it on incognito chrome page - there is no cache working here.
When i create second menu, footer one and i pick it for first TOP menu and than i want to swap it back to header menu, there is no change in wordpress. I got footer menu on top as header menu and (under F12 debug) footer-1 in footer. Can not go back with 1st menu again as Header one. Should it work like that?

[bkt1916]

Its about lesson 3, i can not add print screens ;/