Wrong row counter in found_rows() result

mysql> select version();

+-------------------------+

| version()               |

+-------------------------+

| 10.0.6-MariaDB-1~wheezy |

+-------------------------+

1 row in set (0.00 sec)

mysql>

mysql> select SQL_CALC_FOUND_ROWS a.alkid from testa a,testb b where a.alkid=b.alkid and a.csoportid=3 and b.nev like'%4000%'order by a.partnumber asc limit 0,20;select found_rows();

+-------+

| alkid |

+-------+

| 33445 |

| 34060 |

| 35587 |

| 34089 |

| 34088 |

| 32390 |

| 34097 |

| 35763 |

| 14846 |

+-------+

9 rows in set (0.01 sec)

+--------------+

| found_rows() |

+--------------+

|          887 |

+--------------+

1 row in set (0.00 sec)

mysql>