tribe-template-factory.class.php
line 91
// Don't show the comments form inside the view (if comments are enabled,
// they'll show on their own after the loop)
if ( ! ( tribe_get_option('tribeEventsTemplate', 'default') == '' ) ) {
//add_filter('comments_template', array( $this, 'remove_comments_template' ) );
}
after remove add_filter everything back to normal.