Add column in WP user but it goes wrong

I add a column to users page, it goes wrong when checkbox is not in correct position. This is my code, can you help me to move checkbox to the correct position?

public static function user_register_columns( $columns ) {
    // create a new array with account just after username, then everything else
    $new_columns = array();
    if ( isset($columns['username']) ) {
        $new_columns['username'] = $columns['username'];
        unset($columns['username']);
    }
    $new_columns['account'] = self::__( 'Account' );
    $new_columns = array_merge($new_columns, $columns);
    return $new_columns;
}
public static function user_column_display( $empty='', $column_name, $id ) {
    $account = WP_ABC_Account::get_instance( $id );

    if ( !$account )
        return; // return for that temp post

    switch ( $column_name ) {
    case 'account':
        $account_id = $account->get_ID();
        $user_id = $account->get_user_id_for_account( $account_id );
        $user = get_userdata( $user_id );
        $get_name = $account->get_name();
        $name = ( strlen( $get_name ) <= 1  ) ? '' : $get_name;

        //Build row actions
        $actions = array(
            'edit'    => sprintf( '<a href="#">'.self::__( 'Manage' ).'</a>', $account_id ),
            'payments'    => sprintf( '<a href="#">'.self::__( 'Payments' ).'</a>', $account_id ),
            'gifts'    => sprintf( '<a href="#">'.self::__( 'Gifts').'</a>', $account_id )
        );

        //Return the title contents
        return sprintf( self::__( '%1$s <span style="color:silver">(account&nbsp;id:%2$s)</span> <span style="color:silver">(user&nbsp;id:%3$s)</span>%4$s' ),
            $name,
            $account_id,
            $user_id,
            WP_List_Table::row_actions( $actions )
        );
        break;

    default:
        // code...
        break;
    }
}

Result look like this, checkbox is not in correct position. It must always on left.

Thank you