Hi, my server before was 46.105.104.48:27105

I added a dns and now it is ttt.vendettaservers.es:27015

But gametracker thinks it is ttt.vendettaservers.es:27105 instead.

How can i change the port to 27015 instead of 27105?

Correct - there has never been a feature to change the join port of a page.

DNS only works when the join port does not change.

You can add your new server here http://www.gametracker.com/servers/

The page appears as broken because there is no server setup as 188.165.217.62:27105 (where the DNS is pointing to at the moment). However, you can still access it at:

http://www.gametracker.com/server_info/46.105.104.48:27105/

and remove the DNS if desired on this page:

http://www.gametracker.com/server_info/46.105.104.48:27105/manage/

Already changed ip port from ttt.vendettaservers.es:27015 to
ttt.vendettaservers.es:27105

What now? Do i just have to wait for it to change?

DNS only works when the join port does not change.

You can add your new server here http://www.gametracker.com/servers/