I know this is a weird question, but do you know why the same random seed produced by the game itself produce a different world when it's pasted into the seed menu? I mean, the exact same number should produce the same world, and it dose kind of, but the initial game world the seed produces when found randomly is always different from the same number pasted into the seed menu. For example, the seed 1757285705155 makes a chunk that looks like this when you press down. 
However when pasted it looks like this. 
I know this is a nit pick, and this is still interesting, I'm just curious.