hi Im trying to set my server in favorites as counter strike source but it goes to garrys mod I had the server gmod and changed it to css but each time i try removing it then adding it just goes to gmod.

If you claim the server, you can change the gametype if it has changed since it was first added.

Adding and removing the server from your favorites doesn't change the gametype - unless it is being added to the database when it was not in there.