Text fields with select widgets (radio buttons) do not get imported

As stated in the title, if I have a text field with radio buttons and a set of allowed values, the values do not get imported from CSV even though I've ensured they all match correctly.

Importer:

$feeds_importer = new stdClass;
$feeds_importer->disabled = FALSE; /* Edit this to true to make a default feeds_importer disabled initially */
$feeds_importer->api_version = 1;
$feeds_importer->id = 'people';
$feeds_importer->config = array(
  'name' => 'People',
  'description' => 'Imports people',
  'fetcher' => array(
    'plugin_key' => 'FeedsFileFetcher',
    'config' => array(
      'allowed_extensions' => 'txt csv tsv xml opml',
      'direct' => FALSE,
    ),
  ),
  'parser' => array(
    'plugin_key' => 'FeedsCSVParser',
    'config' => array(
      'delimiter' => ',',
      'no_headers' => 0,
    ),
  ),
  'processor' => array(
    'plugin_key' => 'FeedsNodeProcessor',
    'config' => array(
      'content_type' => 'person',
      'expire' => '-1',
      'author' => '1',
      'mappings' => array(
        0 => array(
          'source' => 'title',
          'target' => 'title',
          'unique' => FALSE,
        ),
        1 => array(
          'source' => 'firstname',
          'target' => 'field_firstname',
          'unique' => FALSE,
        ),
        2 => array(
          'source' => 'lastname',
          'target' => 'field_lastname',
          'unique' => FALSE,
        ),
        3 => array(
          'source' => 'email',
          'target' => 'field_email',
          'unique' => FALSE,
        ),
        4 => array(
          'source' => 'phone',
          'target' => 'field_phone',
          'unique' => FALSE,
        ),
        5 => array(
          'source' => 'direct',
          'target' => 'field_extension',
          'unique' => FALSE,
        ),
        6 => array(
          'source' => 'location',
          'target' => 'field_location',
          'unique' => FALSE,
        ),
        7 => array(
          'source' => 'team',
          'target' => 'field_department',
          'unique' => FALSE,
        ),
        8 => array(
          'source' => 'im',
          'target' => 'field_im',
          'unique' => FALSE,
        ),
        9 => array(
          'source' => 'guid',
          'target' => 'guid',
          'unique' => 1,
        ),
      ),
      'update_existing' => '0',
      'input_format' => 'plain_text',
    ),
  ),
  'content_type' => '',
  'update' => 0,
  'import_period' => '-1',
  'expire_period' => 3600,
  'import_on_create' => 1,
  'process_in_background' => 0,
);