Hi, we got this problem recently. When adding new domains(recent 3 or 4) to cloudflare, when scans it adds 200 random records. All domains comes from same provider. (ns1.serveriai.lt etc) It was not a problem before.
The problem is: it should not be added.
The second problem is to remove those 200 records one by one.
I don’t see a question here, but it sounds like you had a wildcard DNS record that responded for many hostnames that the Cloudflare scanner looks for.
Unfortunately, this happens frequently and there’s no easy way around it, other than a no-scan option when adding a domain. Nor is there a mass-delete option in DNS. Both would be nice.