update and delete event_types are labeled with incorrect/garbled characters

MariaDB [test]> insert into t1 values (0,0);

Query OK, 1 row affected (0.04 sec)

MariaDB [test]> select * from t1;

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

| a    | b    |

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

|    0 |    0 |

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

1 row in set (0.00 sec)

MariaDB [test]> update t1 set b=1 where a = 0;

Query OK, 1 row affected (0.03 sec)

Rows matched: 1  Changed: 1  Warnings: 0

MariaDB [test]> select * from t1;

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

| a    | b    |

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

|    0 |    1 |

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

1 row in set (0.00 sec)

MariaDB [test]> insert into t1 values (0, 2);

Query OK, 1 row affected (0.03 sec)

MariaDB [test]> delete from t1 where b = 1;

Query OK, 1 row affected (0.03 sec)

[root@eb9c5aaf87f8 /]# /usr/bin/mxs_adapter -ucdcuser -pcdc -hmaxscale -P4001 test t1

1 rows and 0 transactions inserted in 5.44538 seconds. GTID = 0-1-3

1 rows and 1 transactions inserted in 0.331933 seconds. GTID = 0-1-4

1 rows and 0 transactions inserted in 5.54281 seconds. GTID = 0-1-4

1 rows and 1 transactions inserted in 0.324007 seconds. GTID = 0-1-5

1 rows and 1 transactions inserted in 0.493277 seconds. GTID = 0-1-6

MariaDB [test]> select * from t1;

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

| a    | b    | domain | event_number | event_type | sequence | server_id | timestamp  |

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

|    0 |    0 |      0 |            1 | insert     |        3 |         1 | 1512936904 |

|    0 |    0 |      0 |            1 | _CpNoTf_   |        4 |         1 | 1512937641 |

|    0 |    1 |      0 |            2 | _CpNoTf_   |        4 |         1 | 1512937641 |

|    0 |    2 |      0 |            1 | insert     |        5 |         1 | 1512937971 |

|    0 |    1 |      0 |            1 | NULL       |        6 |         1 | 1512938047 |

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

5 rows in set (0.03 sec)