static dns entries changes by themself

Good Day!

So i have that kind of environment

1) Two windows server 2012 r2 with terminal services role with created collection, both servers are part of it.

2) IP virtualization per session is up at those servers via local policy(because our domain controller is 2008 r2)

3) There are two static entries in dns, for example terminal_server_1 192.168.0.10 and terminal_server_2 192.168.0.11

So here is the trouble

If new session takes new ip address for example 192.168.0.12, static dns entry changes ip address for terminal_server_2 to 192.168.0.12

And after that users just cant connect to server collection.