This should fix the flash issues

First, the route to:
 '/': {
    view: 'home/index'
  },

....was preventing the policy from working.  

Second, you don't want to use req.flash because when you redirect the message stuff will be gone.

Third, I think you need a slash in your index.ejs view form (e.g. action="/home/register">)

Hope this helps.

Best, Irl