Inaccurate DNS Queries for _ldap services - DC Name part of Domain Name

Hi all, on w2k8 R2 member servers I observe mal formed  DNS queries for _ldap constantly.

The DC Name ist part of the domain name. The DNS queries look like this:

1) QRecord: _ldap._tcp.my-site-name._sites.My-DC-NAME.mydomain.net of type SRV on class Internet

2) Dns: QueryId = 0x432E, QUERY (Standard query), Response - Name Error

3) QRecord: _ldap._tcp.My-DC-NAME.mydomain.net

4) Dns: QueryId = 0x432E, QUERY (Standard query), Response - Name Error

Any ideas why the DC Name ist part of the Domain name, what is causing this DNS queries and what are possible impacts for the member Servers?

Thank You

Jochen