Resolver - Flip of query results ; Network issue to auth. Nameserver?

I notice some fluctuating in resolving results while using different Path to the CF POPs. My assumption is, that the query results has a dempendency to the physical site packets have to pass throught.

Queries to the site coming via DE-CIX are sometimes answered with a SERVFAIL for a specific domain. Queries answered via PITER-IX (Helsiniki) don´t show this flipping in query ressults.

Any idea for the cause for the flip?

%dig crsend._domainkey.photon.info txt @1.1.1.1 +nsid

; <<>> DiG 9.18.18-0ubuntu0.22.04.1-Ubuntu <<>> crsend._domainkey.photon.info txt @1.1.1.1 +nsid
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 45407
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; EDE: 22 (No Reachable Authority): (at delegation photon.info.)
; NSID: 36 33 37 6d 31 34 ("637m14")
;; QUESTION SECTION:
;crsend._domainkey.photon.info. IN      TXT

;; Query time: 28 msec
;; SERVER: 1.1.1.1#53(1.1.1.1) (UDP)
;; WHEN: Thu Feb 08 21:08:39 CET 2024
;; MSG SIZE  rcvd: 100


vs.

%dig crsend._domainkey.photon.info txt @1.1.1.1 +nsid

; <<>> DiG 9.18.18-0ubuntu0.22.04.1-Ubuntu <<>> crsend._domainkey.photon.info txt @1.1.1.1 +nsid
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 40527
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; NSID: 36 39 36 6d 31 39 33 ("696m193")
;; QUESTION SECTION:
;crsend._domainkey.photon.info. IN      TXT

;; ANSWER SECTION:
crsend._domainkey.photon.info. 600 IN   TXT     "v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA0QEGWlahUxRI1wmnN7bbOWT+XDOjDiS2gJwhBJhKGmuLE8NiJBcrguZs6Pi9IVgcnjhhBbZNi0HgR70CX4+aa/Ljl9DWwLh7XvIbjgBg4T8OiCrHnF8srtIIvecpZJm6uQBz/hKLDDcI80PWsu9aXc5ISMsFgNBGUi87BfGtjVJ5su8wMjkKb6m6duO200Xvk" "vJRaqq4gzLteqDO68SfLVA/Fg5LIzCZaruC/6LS9ZLZDjhlom5WCmAE4GXrPbOaeWrLhIz5RsjMAKuLwi7EMymDsml8u1Swo5SSmEYTKIGemYMfJBJRnYCaIqdK9tkUEkU1AUJZA9W+u1KaAoQqCwIDAQAB"

;; Query time: 12 msec
;; SERVER: 1.1.1.1#53(1.1.1.1) (UDP)
;; WHEN: Thu Feb 08 21:07:27 CET 2024
;; MSG SIZE  rcvd: 493

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