I think it was explained that humans have this huge war that nearly wiped them out until Salam guy stepped in and created a space for humans, many were displaced especially children, other humans lived other human settlements i guess, and children were sent to the orphanage???
Come to think of it... OP is kinda right. The timeline is a bit wobbly.
Does it mean it hasn't been decades since the war?
If so, they are probably not on earth.... but then how did humans get there if it isn't earth?
And what about the humans who died in Salam's sanctum?
Maybe... the children were children of wayward humans (humans who couldn't get to the sanctum / can't / couldn't stay in the sanctum?) ???
I think I need to reread the beginning to make guesses :))))
Current circumstances aside...and maybe the author dont have intention to further the world building of this universe. Im so curious why theres a lot of abandon/orphaned babies?