re[Pdns-users] ply from unexpected source: x.x.x.x#16225, expected x.x.x.x#53

[misterd]

PowerDNS server problem:

if i dig for a domain in my slave server i get the following output
dig @x.x.x.x www.xxx.nl

;; reply from unexpected source: x.x.x.x#16225, expected x.x.x.x#53
;; reply from unexpected source: x.x.x.x#16225, expected x.x.x.x#53
;; reply from unexpected source: x.x.x.x#16225, expected x.x.x.x#53

; <<>> DiG 9.3.4-P1.1 <<>> @x.x.x.x www.xxx.nl
; (1 server found)
;; global options:  printcmd
;; connection timed out; no servers could be reached

tcpdump -ni any port 53

13:04:59.170932 IP y.y.y.y.53 > z.z.z.z.48423: 12475*- 1/0/0 A z.z.z.z (49)
13:05:04.178045 IP z.z.z.z.48423 > y.y.y.y.53: 12475+ A? www.xxx.nl. (33)
13:05:04.178187 IP y.y.y.y.53 > z.z.z.z.48423: 12475*- 1/0/0 A z.z.z.z (49)
13:05:09.187709 IP z.z.z.z.48423 > y.y.y.y.53: 12475+ A? www.xxx.nl. (33)
13:05:09.187860 IP y.y.y.y.53 > z.z.z.z.48423: 12475*- 1/0/0 A z.z.z.z (49)

where x.x.x.x is outside ip-adres (ip-adres of router)
where y.y.y.y is inside ip-adres (local ip-adres of machine)
where z.z.z.z is ip-adres of server doing the dig request

why do i get an answer on the wrong port?
everything looks good but it doesn't work, any help or tips?

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