i had 2 servers one 89.39.13.21:27015 dns go.brusc.ro and another 89.39.13.19:27015 arena.brusc.ro , in my cpanel i changed the ip for arena. to be same as go. 89.39.13.21 and now my go. server on gametracker is deleted and it shows the statistics of the arena. server WTF? what can i do, i deleted the dns from cpanel but it still shows the wrong statistics

From what you are saying; both servers have or had the same port number.
They can not also share the same IP.
Gametracker would see them both as the same server.

i had two different servers different ips, same port and both had different DNS on gametracker

i changed the DNS in my cpanel for both servers with same IP without knowing that gametracker will delete one of them because it see them as same server

and gt deleted the statistics of the actual server 89.39.13.21:27015 and replaced with the statistics from the ip i deleted 89.39.13.19:27015

so now i don't have the actual statistics for the server 89.39.13.21:27015

how can i get back that statistics? for 89.39.13.21!

This server is reporting the correct information. If you believe it to be reporting the incorrect server (ie. server name, map, online players, etc), please contact your host to help you configure the IP correctly.

In regard to any historical player stats, you've said very little about what went wrong. Regardless, if you migrated in the wrong direction or used DNS in the wrong direction, there is no way to recover stats that have been permanently removed.