issue with facets improperly displaying

application.rb

    config.fits_to_desc_mapping = { 
      :format_label => :format,
      :last_modified => :date_modified,
      :original_checksum => :identifier,
      :rights_basis => :rights,
      :copyright_basis => :rights,
      :copyright_note => :rights,
      :file_title => :title,
      :file_author => :creator,
      :file_language => :language
    }   

generic_file.rb

# delegates to the datastream
  delegate :resource_type, :to => :descMetadata
  delegate :format, :to => :descMetadata
  delegate :identifier, :to => :descMetadata
  delegate :format_label, :to => :characterization

# characterize calls this fcn
  def append_metadata
    terms = self.characterization_terms
    ScholarSphere::Application.config.fits_to_desc_mapping.each_pair do |k, v|
      if terms.has_key?(k)
        proxy_term = self.send(v)
        if terms[k].is_a? Array
          terms[k].each do |term_value|
            proxy_term << term_value unless proxy_term.include?(term_value)
          end 
        else
          proxy_term << terms[k]
        end 
      end 
    end 
  end