委譲設定の間違い。 cloudflare NS だけにしておけばよかった。
1. whois
2. history
rf-nz.ch:#NS 4 matarikinetwork.com {'delete1991.dynadot.net.', 'delete1990.dynadot.net.',
'hank.ns.cloudflare.com.', 'may.ns.cloudflare.com.'}
rf-nz.ch:timeout matarikinetwork.com delete1991.dynadot.net.
rf-nz.ch:RF matarikinetwork.com delete1991.dynadot.net.
rf-nz.ch:timeout matarikinetwork.com delete1990.dynadot.net.
rf-nz.ch:RF matarikinetwork.com delete1990.dynadot.net.
rf-nz.ch:diff matarikinetwork.com {'hank.ns.cloudflare.com.', 'may.ns.cloudflare.com.'}
rf-nz.ch:diff matarikinetwork.com {'hank.ns.cloudflare.com.', 'may.ns.cloudflare.com.'}