While starting your rails server, if you have seen this warning then you are at the right place.
=> Booting WEBrick => Rails 18.104.22.168 application starting in development on http://localhost:3001 => Run `rails server -h` for more startup options => Ctrl-C to shutdown server [WARNING] Precompiled views present and Deface is enabled, this can result in overrides being applied twice. [2016-03-08 07:23:36] INFO WEBrick 1.3.1 [2016-03-08 07:23:36] INFO ruby 2.2.1 (2015-02-26) [x86_64-linux] [2016-03-08 07:23:36] INFO WEBrick::HTTPServer#start: pid=30903 port=3001
Why I am seeing
Login button twice??
I got the answer
$ rake deface:clean # Removes all precompiled override templates
But you will face complications associated with this in production environment. For now in development environment it works fine.