Reverse DNS lookup returns the results in "hostname.domain.comx.x.x.in-addr.arpa." format instead of "hostname.domain.com" format

Issue

Reverse DNS lookup returns the results in "hostname.domain.comx.x.x.in-addr.arpa." format instead of "hostname.domain.com" format.

dig -x 10.10.10.10

; <<>> DiG 9.9.4-RedHat-9.9.4-38.el7_3.3 <<>> -x 10.10.10.10
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 63349
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 2

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;10.10.10.10.in-addr.arpa.  IN  PTR

;; ANSWER SECTION:
10.10.10.10.in-addr.arpa. 86400 IN  PTR server.example.com.10.10.10.in-addr.arpa.

Expected output :

dig -x 10.10.10.10

; <<>> DiG 9.9.4-RedHat-9.9.4-38.el7_3.3 <<>> -x 10.10.10.10
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 63349
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 2

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;10.10.10.10.in-addr.arpa.  IN  PTR

;; ANSWER SECTION:
10.10.10.10.in-addr.arpa. 86400 IN  PTR server.example.com.