Другой формат json для списка карт

почему для этого java-кода может быть получен другой результат?

List<Map<String,String>> searchSelectBoxJuso = patentService.searchSelectBoxJuso(patentVO);
...
JSONObject json = new JSONObject();
​
response.setContentType("text/html;charset=utf-8");
json.put("searchSelectBoxJuso" ,searchSelectBoxJuso);
PrintWriter out = response.getWriter();
out.print(json);

в Windows

{"searchSelectBoxJuso":[{"fieldCodeDetailName":"All","fieldCodeDetailId":"217"},{"fieldCodeDetailName":"City1","fieldCodeDetailId":"21701"},{"fieldCodeDetailName":"City2","fieldCodeDetailId":"21702"}]}

в Linux

{"searchSelectBoxJuso":[{fieldCodeDetailName=All, fieldCodeDetailId=217}, {fieldCodeDetailName=City1, fieldCodeDetailId=21701}, {fieldCodeDetailName=City2, fieldCodeDetailId=21702}]}