rails 3.2 nested form names not correct

[Me]

I have a person has many questions model,  I have accepts_nested_Attributes set up properly.  the question from the db show up, but the index is not incrementing:

<%= f.fields_for :person_questions do |pregunta| %>

          Questions: <br/>

          <% Question.all.each do |question| %>

            <%= render 'questions/question_type', :pregunta => pregunta, :question => question, :f => f %>

          <% end %>

        <% end %>

        <div class="control-group">

          <%= f.label :date_of_problema, :class => 'control-label' %>

          <div class="controls">

            <%= f.datepicker :date_of_problema, :class => 'date_select' %>

          </div>

        </div>

partial:

<div class="control-group">

  <%= pregunta.label question.name, (question.label_text unless question.label_text.nil?), :class => 'control-label' %>

  <div class="controls">

    <%= pregunta.send(question.data_type, :option_selected ) %>

    <%= pregunta.hidden_field :question_id, :value => question.id , :class => "#{question.data_type}" %>

  </div>

</div>

Is there a way to get the attribute names to be correct?

The questions come from the db.

chrome inspector:

<input id="person_person_questions_attributes_0_option_selected" name="person[person_questions_attributes][0][option_selected]" type="checkbox" value="1">

<input id="person_person_questions_attributes_0_option_selected" name="person[person_questions_attributes][0][option_selected]" size="30" type="text">