执行排序V2.1 Sphinx时发现的未匹配总数计数

当我对某个unixtimestamp日期字段进行排序时，找到的总计数显示不同的结果。这是我的问题

SELECT * FROM CA_SAC_persons,CA_KC_persons,CA_SFC_persons,CA_SJ_persons
WHERE MATCH('@fullname("^John$" | "^Joseph$" | "^Jose$" | "^Josh$" | "^Robs$")') 
ORDER BY filing_date_ts DESC LIMIT 0,1;SHOW META; 

Result :
+---------------+-------------+
| Variable_name | Value       |
+---------------+-------------+
| total         | 1000        |
| total_found   | 4813        |
| time          | 0.019       |
| docs[9]       | 4603        | 
| hits[9]       | 5312        |
+---------------+-------------+

SELECT * FROM CA_SAC_persons,CA_KC_persons,CA_SFC_persons,CA_SJ_persons
WHERE MATCH('@fullname("^John$" | "^Joseph$" | "^Jose$" | "^Josh$" | "^Robs$")') 
ORDER BY filing_date_ts ASC LIMIT 0,1;SHOW META; 

Result :
+---------------+-------------+
| Variable_name | Value       |
+---------------+-------------+
| total         | 1000        |
| total_found   | 4812        |
| time          | 0.019       |
| docs[9]       | 4603        | 
| hits[9]       | 5312        |
+---------------+-------------+

为什么在第二次查询中发现的总数少了1条记录？

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