Hi @whoaloic
Well, in that case use get_sub_field_object() instead of get_sub_field() function. i.e.
$sub_field_object = get_sub_field_object('checkbox_field_name');
$value = $sub_field_object['value']; // values
$label = $sub_field_object['label']; // labels
Have a look at the documentation for get_sub_field_object() for more info: http://www.advancedcustomfields.com/resources/get_sub_field_object/
