Hello.
When I'm trying to add a server, I get the message:
A server with this ip/query_port already exists in the GameTracker database.
But when I try search my server on list or visit server page, I get message:
The server you requested is not in the GameTracker database.

The Server Ip who I try to add: 31.186.83.177:28060

I have another question.
Is it possible to move the statistics from one IP to another. For example, when I change the hosting for my server and I care about statistics and rankings on gametracker.

Try adding it again.

Currently, there is no feature to transfer your statistics to another page. You'll need to add the new information. In regards to your rank, if your server is just as popular, it will regain its rank in about a week.