Multiple queries for same host

[Alex]

HI,

I have a fedora22 system with bind-9.10.2 that is configured to be
authoritative for its domain and also provides recursive query
services for a number of trusted hosts.

I'm seeing a situation where multiple queries for the same host are
occurring in the logs, and I don't understand why. In this case, it's
queries to IPs at spamhaus, although I've changed my key and our
public IP to 192.168.1.27 in this example:

16-Sep-2015 20:18:47.947 queries: client 192.168.1.27#34798
(254.223.16.69.mykey.sbl.dq.spamhaus.net): query:
254.223.16.69.mykey.sbl.dq.spamhaus.net IN A +E (192.168.1.3)
16-Sep-2015 20:18:47.947 queries: client 192.168.1.27#34798
(254.223.16.69.mykey.zen.dq.spamhaus.net): query:
254.223.16.69.mykey.zen.dq.spamhaus.net IN A +E (192.168.1.3)
16-Sep-2015 20:18:47.948 queries: client 192.168.1.27#34798
(254.222.16.69.mykey.sbl.dq.spamhaus.net): query:
254.222.16.69.mykey.sbl.dq.spamhaus.net IN A +E (192.168.1.3)
16-Sep-2015 20:18:47.949 queries: client 192.168.1.27#34798
(254.222.16.69.mykey.zen.dq.spamhaus.net): query:
254.222.16.69.mykey.zen.dq.spamhaus.net IN A +E (192.168.1.3)
16-Sep-2015 20:18:47.949 queries: client 192.168.1.27#34798
(13.185.69.216.mykey.sbl.dq.spamhaus.net): query:
13.185.69.216.mykey.sbl.dq.spamhaus.net IN A +E (192.168.1.3)

It appears to happen most frequently with spamhaus queries, but also
occurs with random other domains.

Can someone help me understand why this is happening? Is the query
being broken down into multiple pieces, perhaps?

I've included my named.conf here in case I'm missing something, in
hopes someone could help me review.

acl "trusted" {
    { 127.0.0.0/8; };
    { 192.168.1.0/24; };
};

options {
    version "None of your business.";

    transfers-out 200;

        // The following paths are necessary for this chroot
    listen-on-v6 { none; };
    listen-on port 53 { 192.168.1.3; 127.0.0.1; };

        directory "/var/named";
        dump-file "/var/tmp/named_dump.db";             // _PATH_DUMPFILE
        pid-file "/var/run/named/named.pid";            // _PATH_PIDFILE
        statistics-file "/var/named/data/named.stats";         // _PATH_STATS
        memstatistics-file "/var/tmp/named.memstats";   // _PATH_MEMSTATS
        // End necessary chroot paths

        check-names master warn;                        /* default. */
        datasize 20M;
    allow-transfer {
        127.0.0.1;
        192.168.1.3;
        192.168.1.27;
    };
    // Prevent outsiders from using juggernaut
    // as their name server for unauthorized queries
    allow-query { trusted; };
    allow-recursion { trusted; };
};

logging {

    category default { named_info; };
    category general { named_info; };
    category lame-servers { null; };

        // Configure general default info
        channel named_info {
                file "/var/log/named.info.log" versions 4 size 10m;
                severity info;
                print-time yes;
                print-category yes;
        };

};

zone "." {
    type hint;
    file "/var/named/named.ca";
};

zone "localhost" {
        type master;
        file "masters/localhost";
        check-names fail;
        allow-update { none; };
        allow-transfer { any; };
};

zone "0.0.127.in-addr.arpa" {
        type master;
        file "masters/db.127.0.0";
        allow-update { none; };
        allow-transfer { any; };
};

zone "0/27.1.168.192.in-addr.arpa" {
    type master;
    file "masters/db.1.168.192";
    allow-query { any; };
    allow-transfer { trusted; };
};

zone "mydomain.com" {
    type master;
    file "masters/db.mydomain.com";
    allow-query { any; };
    allow-transfer { trusted; };
};