problem with dig +trace

[DNSPod]

hi all,

I found a problem with recursion

when I try to use dig +trace domain.com, I got a refuse reply like this

Sam at Sam:~$ dig +trace google.com

; <<>> DiG 9.6.0-APPLE-P2 <<>> +trace google.com
;; global options: +cmd
;; Received 12 bytes from 221.130.12.61#53(221.130.12.61) in 53 ms

tcpdump result

16:16:23.190391 IP (tos 0x80, ttl 49, id 0, offset 0, flags [DF],  
proto UDP (17), length 40)
     dnspod.newhua.domain > 10.0.1.2.52317: [udp sum ok] 58277  
Refused- [0q] 0/0/0 (12)
	0x0000:  001e c2bd aefc 001e 52f6 8e12 0800 4580  ........R.....E.
	0x0010:  0028 0000 4000 3111 5484 dd82 0c3d 0a00  .(.. at .1.T....=..
	0x0020:  0102 0035 cc5d 0014 dac6 e3a5 8005 0000  ...5.]..........
	0x0030:  0000 0000 0000                           ......

and the server's log

Sep 18 16:45:42 newhua /usr/local/sbin/maradns:  Log: Message  
received, processing
Sep 18 16:45:42 newhua /usr/local/sbin/maradns: Query from:  
61.179.151.106 N.
Sep 18 16:45:42 newhua /usr/local/sbin/maradns:  Log: Bad query  
received:  
\373\316\000\000\000\001\000\000\000\000\000\000\000\000\002\000\001
Sep 18 16:45:42 newhua /usr/local/sbin/maradns: From IP: 61.179.151.106
Sep 18 16:45:42 newhua /usr/local/sbin/maradns:  Log: I'm sorry Dave  
(recurse attempt)


any ideas?