Passing a block to the title helper inside an index as a blog causes the actual page header to be preceded with the content of the block (this code is copied directly from activeadmin.info with only a change to the resource name):
index :as => :blog do
title do |evt|
span evt.topic, :class => 'title'
span evt.created_at, :class => 'created_at'
Relevant versions: AA 0.4.3, Rails 3.2.2, Ruby 1.9.3-p0
My best guess is that the title helper is colliding with another helper.
Same as #1584