Unexpected results with rspec and factory girl

_spec.rb

require 'spec_helper'

describe Article do
  it 'can set the privacy' do
    article = create(:article)
    article.comments.first.privacy.should eq 'low'  #Pass

    comment = article.comments.first
    comment.privacy.should eq 'low'                 #Pass

    comment.privacy = 'high'
    comment.privacy.should eq 'high'                #Pass

    article.comments.first.privacy = 'high'
    article.comments.first.privacy.should eq 'high' #Fail: expected 'high' got 'low'
  end
end

article.rb

class Article < ActiveRecord::Base
  has_many :comments
  attr_accessible :content, :title
end

comment.rb

class Comment < ActiveRecord::Base
  belongs_to :article
  attr_accessible :content, :privacy
end

factories.rb

FactoryGirl.define do

  factory :article do
    sequence(:title) { |n| "Article ##{n}"}
    content 'Lorem ipsum'

    after_create do |article, eval|
      FactoryGirl.create_list(:comment, 1, article: article)
    end

  end

  factory :comment do
    privacy 'low'
    content 'dolor sit amet.'
  end

end