Question About Mirrors

[Botar]

I'm a new user of GCW and I'm confused about the mirrors. I select one of the mirrors, say North American Mirror #5.
Then a navigate to a file to download, in my case the nocd for Tony Tough. When I go to download it, I'm presented with
another list of mirrors I can use, in this case NA Mirrors #1 and #2. Why is this?
I thought I was already at Mirror #5.
And then when I select one of the mirrors presnted to me and ask for the file download, I'm told that it does not have the file or that the file is more than two months old. If the mirror doesn't have the file why direct me there? And hey, if the file is older than two months it's ok, I still want that file for my older game.!

Please help me understand!