Callback_after_insert spawning multiple row in table

I'm trying to log admin activity and generating the crud via helper, it's working great but there's one problem.

When it's logging the data after the user just *updating* one row, it spawning like 4-6 insert AND update log data to the log table.

Can anyone help me in this case?

Here is my code in the helper.

function render_event($table_name)
{
    $CI = & get_instance();  
    $crud = new grocery_CRUD();
    $crud->set_table($table_name);

    if ($CI->session->userdata('privileges') > 2) {
        $crud->unset_add();
        $crud->unset_print();
        $crud->unset_export();
        $crud->unset_edit();
        $crud->unset_delete();
    } elseif ($CI->session->userdata('privileges') > 1) {
        $crud->unset_delete();
        $crud->callback_after_insert(log_execution('insert', $table_name));
        $crud->callback_after_update(log_execution('update', $table_name));
    } else {
        $crud->callback_after_insert(log_execution('insert', $table_name));
        $crud->callback_after_update(log_execution('update', $table_name));
    }

    return $crud->render();
}

and the log_execution() in the same helper file

function log_execution($exec, $table_name)
{
    $CI = & get_instance();  
    $log_data = array(
        'uid' => $CI->session->userdata('uid'),
        'username' => $CI->session->userdata('username'),
        'execution' => $exec,
        'table_name' => $table_name,
        'date_execution' => date('Y-m-d H:i:s')
    );

    $CI->db->insert('operations_logs', $log_data);
}

Callback_after_insert spawning multiple row in table

wahyuhandy