pug - Can not see the Jade-Bootstrap navigation bar after moving to header.jade -

home.jade:

extends layout block body     +navbar("...","dropdown_menu","inverse")         +nav_item("index.html","active") home         +nav_item("h...") chat     .container 

layout.jade:

extends ../node_modules/jade-bootstrap/_bootstrap doctype html html     head         block head             block title                 title program name             block meta     body         include header          block content          include footer 

after moving 3 nav lines header.jade , removing leading tabs, navigation bar not visible anymore.

header.jade (originally):

+navbar("...","dropdown_menu","inverse")     +nav_item("index.html","active") home     +nav_item("https://...") chat 

latest header.jade:

extends ../node_modules/jade-bootstrap/_bootstrap +navbar("...","dropdown_menu","inverse")     +nav_item("index.html","active") home     +nav_item("https://...") chat