A Random Generation world loaded into are world which is flat

Hello my name is Nick, Me and my friend Jadias are all was play on the world and it's flat.

Its my friend Jadias which he's username is : jkellz777 

On he's world, And what happened is that we went to expand are world.

When he got in, and saw the generated world. And this started 2 mouths ago.

Now we are hoping Mojang Can fix it please fix the world.

The Generated world is like a infant world when the real world is on flat.

Username: jkellz777

Platform: Xbox One

World Name: Abc 123 jadias 

And please let one of you join us because we don't want are hole world to be deleted.

The world is 1 year old.

My Username: GamerXD3469

If you need more pictures or proof I'd love to provide you some.

I hope your reading this.

Thank you for your time