DNS resolution problem with 'kadaster.nl' on Cloudflare DNS

Good day! I use Cloudflare in my network and it has come to my attention that I am unable to access kadaster.nl using Cloudflare’s DNS servers.

I’ve tried using the Purge tool on your website with no success!

Here is the relevant diagnostics!

dig kadaster.nl @ 1.1.1.1
; <<>> DiG 9.10.6 <<>> [email protected]
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 57926
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1452
;; QUESTION SECTION:
;kadaster.nl.			IN	A

;; Query time: 4017 msec
;; SERVER: 1.1.1.1#53(1.1.1.1)
;; WHEN: Wed Feb 19 15:55:43 CET 2020
;; MSG SIZE  rcvd: 40

dig kadaster.nl @ 1.0.0.1
; <<>> DiG 9.10.6 <<>> [email protected]
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 64056
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1452
;; QUESTION SECTION:
;kadaster.nl.			IN	A

;; Query time: 1200 msec
;; SERVER: 1.0.0.1#53(1.0.0.1)
;; WHEN: Wed Feb 19 15:55:50 CET 2020
;; MSG SIZE  rcvd: 40

dig kadaster.nl @ 8.8.8.8
; <<>> DiG 9.10.6 <<>> [email protected]
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 8098
;; flags: qr rd ra ad; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;kadaster.nl.			IN	A

;; ANSWER SECTION:
kadaster.nl.		1138	IN	A	145.77.103.19

;; Query time: 48 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Wed Feb 19 15:55:50 CET 2020
;; MSG SIZE  rcvd: 56

dig +short CHAOS TXT [email protected]
"AMS"

dig +short CHAOS TXT [email protected]
"AMS"

(ed note, as I am a new user the forum software was complaining about @ and then the DNS server as it thought it was mentioning users. So a on purpose space has been put in above.)

The SERVFAIL status generally indicates a DNSSEC issue. https://dnsviz.net/d/kadaster.nl/dnssec/ seems to indicate some errors. Resolving those issues would be a good first step.