DNS Record Creating SubFolder in Zone

Hi Folks,

Today, I have a domain "enterprise.intranet", and a Sharepoint site named intranet.

Until few weeks ago, we have a CNAME Intranet, pointing to our sharepoint site and a SRV record pointing to our KMS Server.

So, yesterday, I see any changes on my DNS. The CNAME records don´t appear on my forward lookup zone, and created a subfolder on my zone.

This is a example:

SERVER

- Forward Lookup Zone

- _msdcs.enterprise.intranet

- enterprise.intranet

-_sites

-_tcp

-_udp

-DomainDNSZones

-ForestDNSZones

-KMS

-Intranet

- (same as parent folder)                alias(CNAME)                Site

I would like to know, why happening these changes?

Because, in my another zones, these changes don´t occur.

And all other records are created normally.

No errors appears on event viewer, scom, adrap.

Thanks.

Daniel Felipe