When i play a game on gamespy arcade there are several servers missing that i play on my other computer, why?

My normal computer (that i play most on) has 85 servers listed

On my other computer there are only 65 listed, the servers that i like to play on are some of the ones that are missing

essentially, my question is How do i get gamespy to list all servers

I had this problem before but it was on a game (Call of Duty). The reason was that the other computer was not registered (didn't put the key code) and i was not using the same internet connection of my primary computer (since it was a laptop and i was using my cousins internet at his house). Don't know if gamespy has a computer registery but see if you can register your second computer either on their site or entering a key code if they provide you with one. Hope it helps.