Reputation not automatically aggregated

[thebravoman]

Adding an evaluation does not result in the aggregated evaluation updating its value
I have:

class Article < ActiveRecord::Base

has_reputation :popularity,
  :source => [
    {:reputation => :rep1, :weight => 0.8},
    {:reputation => :rep2},
  ]

has_reputation :rep1,
  :source => :article,
  :source_of => [{:reputation=>:popularity}]

has_reputation :rep2,
  :source=>:comments,
  :source_of => [{:reputation=>:popularity}]

The problem is

Article.add_evalution(:rep1, 1, Article.first)
Article.reputation_for(:rep1) -> 1.0
Article.reputation_for(:popularity) ->1.0

Then

Article.add_evaluation(:rep2, 2, Comment.first)
Arctile.reputation_for(:popularity) ->1 STILL 1.0.

Why is it still 1.0 is something I can not understand?