I have two domain controllers that act as a Primary and Secondary DNS servers. Server2 is the primary and server1 is the secondary. If I open dnsmgnt on server2 and look at the Reverse Lookup Zones, it looks like this:

If I look at the Reverse Lookup Zones on server1, it looks like this:
What is causing this to be different? On a side note, does every domain controller with a global catalog need to have itself as a DNS server?