Two views displayed on the same page. Illegal choice error.

I tinkered around with it a bit and I found that the error ceases to occur when i enable AJAX on the page view, so whatever the problem is, I guess it's related to the reloading of the page when submitting a filter. That seems strange to me since the page view loads fine when you first navigate to the page.

Also, here are the exported views in question.

Page view:

$view = new view;
$view->name = 'anime_categories';
$view->description = 'Teaser list of all anime by category';
$view->tag = 'index';
$view->view_php = '';
$view->base_table = 'node';
$view->is_cacheable = FALSE;
$view->api_version = 2;
$view->disabled = FALSE; /* Edit this to true to make a default view disabled initially */
$handler = $view->new_display('default', 'Defaults', 'default');
$handler->override_option('fields', array(
  'title' => array(
    'label' => '',
    'link_to_node' => 1,
    'exclude' => 0,
    'id' => 'title',
    'table' => 'node',
    'field' => 'title',
    'relationship' => 'none',
  ),
));
$handler->override_option('filters', array(
  'tid' => array(
    'operator' => 'or',
    'value' => array(
      '47' => '47',
      '53' => '53',
      '55' => '55',
      '49' => '49',
      '52' => '52',
      '54' => '54',
      '59' => '59',
      '57' => '57',
      '60' => '60',
      '50' => '50',
      '62' => '62',
      '48' => '48',
      '63' => '63',
      '61' => '61',
      '51' => '51',
      '56' => '56',
    ),
    'group' => '0',
    'exposed' => TRUE,
    'expose' => array(
      'use_operator' => 0,
      'operator' => 'tid_op',
      'identifier' => 'tid',
      'label' => '',
      'optional' => 0,
      'single' => 1,
      'remember' => 0,
      'reduce' => 0,
    ),
    'type' => 'select',
    'vid' => '6',
    'id' => 'tid',
    'table' => 'term_node',
    'field' => 'tid',
    'hierarchy' => 0,
    'relationship' => 'none',
    'reduce_duplicates' => 0,
  ),
));
$handler->override_option('access', array(
  'type' => 'none',
));
$handler->override_option('empty', 'Sorry, no results found.');
$handler->override_option('empty_format', '1');
$handler->override_option('items_per_page', 15);
$handler->override_option('use_pager', '1');
$handler = $view->new_display('page', 'Page', 'page_1');
$handler->override_option('path', 'anime-categories');
$handler->override_option('menu', array(
  'type' => 'none',
  'title' => '',
  'weight' => 0,
  'name' => 'navigation',
));
$handler->override_option('tab_options', array(
  'type' => 'none',
  'title' => '',
  'weight' => 0,
));

block view:

$view = new view;
$view->name = 'Anime_menu';
$view->description = 'Alphabetically sortable anime menu';
$view->tag = 'menu';
$view->view_php = '';
$view->base_table = 'node';
$view->is_cacheable = FALSE;
$view->api_version = 2;
$view->disabled = FALSE; /* Edit this to true to make a default view disabled initially */
$handler = $view->new_display('default', 'Defaults', 'default');
$handler->override_option('fields', array(
  'title' => array(
    'label' => '',
    'link_to_node' => 1,
    'exclude' => 0,
    'id' => 'title',
    'table' => 'node',
    'field' => 'title',
    'override' => array(
      'button' => 'Override',
    ),
    'relationship' => 'none',
  ),
));
$handler->override_option('filters', array(
  'tid' => array(
    'operator' => 'or',
    'value' => array(
      '6' => '6',
      '9' => '9',
      '10' => '10',
      '11' => '11',
      '17' => '17',
      '12' => '12',
      '13' => '13',
      '15' => '15',
      '16' => '16',
      '18' => '18',
      '19' => '19',
      '20' => '20',
      '21' => '21',
      '22' => '22',
      '23' => '23',
      '24' => '24',
      '25' => '25',
      '26' => '26',
      '27' => '27',
      '28' => '28',
      '29' => '29',
      '30' => '30',
      '31' => '31',
      '32' => '32',
      '33' => '33',
      '34' => '34',
      '35' => '35',
    ),
    'group' => '0',
    'exposed' => TRUE,
    'expose' => array(
      'use_operator' => 0,
      'operator' => 'tid_op',
      'identifier' => 'tid',
      'label' => '',
      'optional' => 0,
      'single' => 1,
      'remember' => 1,
      'reduce' => 0,
    ),
    'type' => 'select',
    'vid' => '2',
    'id' => 'tid',
    'table' => 'term_node',
    'field' => 'tid',
    'hierarchy' => 0,
    'override' => array(
      'button' => 'Override',
    ),
    'relationship' => 'none',
    'reduce_duplicates' => 0,
  ),
  'type' => array(
    'operator' => 'in',
    'value' => array(
      'anime' => 'anime',
    ),
    'group' => '0',
    'exposed' => FALSE,
    'expose' => array(
      'operator' => FALSE,
      'label' => '',
    ),
    'id' => 'type',
    'table' => 'node',
    'field' => 'type',
    'relationship' => 'none',
  ),
));
$handler->override_option('access', array(
  'type' => 'none',
));
$handler->override_option('empty', 'Sorry, no results found');
$handler->override_option('empty_format', '1');
$handler->override_option('use_ajax', TRUE);
$handler->override_option('items_per_page', 99);
$handler->override_option('use_pager', '1');
$handler = $view->new_display('block', 'Block', 'block_1');
$handler->override_option('block_description', '');
$handler->override_option('block_caching', -1);

Thanks for responding, but I'm not sure what to make of that. Is that proper behavior? Are page views and block views with exposed filters not designed to exist on the same page?

The block view was using ajax. It's the page view that was not using ajax. The error occurs when submitting an option for the exposed page view filter, not the block view. Does that change anything?

Yes, they both shared the same identifier "tid", I changed the block views identifier and it works perfectly.

Thanks!