Dns is not updating
If you want more information you may find the following useful:
DNS Scavenging is a great answer to a problem that has been nagging everyone since RFC 2136 came out way back in 1997.
Next job is to run DNSCMD /info in a command prompt.
The bit you are interested in here is the Listen Addresses, the image above is from a site where I have corrected this issue already.
I found that my DNS servers had scavenging set for 3 days and my dhcp scope was set to 1 day leases.
I changed the scavenging and then made sure that I selected to scavenge for stale resource records.