_dmarc is delegated to ns.vali.email. If you want the value you set in your Cloudflare DNS to be used, delete the NS record for _dmarc.
email. 172800 IN NS v0n0.nic.email.
email. 172800 IN NS v0n1.nic.email.
email. 172800 IN NS v0n2.nic.email.
email. 172800 IN NS v0n3.nic.email.
email. 172800 IN NS v2n0.nic.email.
email. 172800 IN NS v2n1.nic.email.
;; Received 437 bytes from 192.58.128.30#53(j.root-servers.net) in 65 ms
gnetsolutions.email. 3600 IN NS etta.ns.cloudflare.com.
gnetsolutions.email. 3600 IN NS darwin.ns.cloudflare.com.
;; Received 112 bytes from 65.22.27.35#53(v2n0.nic.email) in 27 ms
_dmarc.gnetsolutions.email. 300 IN NS ns.vali.email.
;; Received 77 bytes from 2606:4700:50::adf5:3a9c#53(etta.ns.cloudflare.com) in 34 ms
_dmarc.gnetsolutions.email. 600 IN TXT "v=DMARC1; p=none; rua=mailto:[email protected]"
;; Received 143 bytes from 3.33.176.182#53(ns.vali.email) in 59 ms