Because there are more Indians than pakistanis
Besides that there are other ethnicities here, and believe it or not we share one thing in common which is we hate each other.
"Keep your friends close, but your enemies closer"
But if the moderators are Pakistanis, they can make sure that the number of Indian members doesn't exceed the number of Pakistani ones. But they don't do that, which is why you are more Indian members on Pakistani forums than vice versa.