Ruby on Rails

i have items, item_item_properties, and item_properties

items has many item_properties with the key item_type_id in both tables

the name value pairs are stored in item_item_properties

the problem i'm having is not all item_properties are showing up in the form

what makes the difference which one's show up and which one's don't I don't know

items_controller.rb

  def edit

_form.html.erb

            <%= f.fields_for :item, :item_item_properties do |iip| %>
                      <div class="item_item_property">
                          <% @item.item_item_properties.each do |item_item_property| %>
                                <tr><td><%= iip.label item_item_property.item_property.name %><td><%= iip.hidden_field :item_property_id, value: item_item_property.item_property_id %> <%= iip.text_field  :text_value, value: item_item_property.text_value %>
                         <% end %>
                      </div>
            <% end %>