SERVFAIL errors on DNS resolution

Since today 1.1.1.1 has issues resolving some domain names.

For example:
lecker.de
elektronische-datenkopie.de

Cloudflare status page says there are no issues, but this is a cloudflare side issue for sure as other DNS providers don’t have problems with those domains.

How can I submit this problem to cloudflare?

Both are from United Domains and this was solved somehow:

nslookup lecker.de 1.1.1.1
Server:         1.1.1.1
Address:        1.1.1.1#53

Non-authoritative answer:
Name:   lecker.de
Address: 91.195.xx.xxx


nslookup elektronische-datenkopie.de 1.1.1.1
Server:         1.1.1.1
Address:        1.1.1.1#53

Non-authoritative answer:
Name:   elektronische-datenkopie.de
Address: 128.65.xx.xxx
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