Baking high definition mesh issues

So I have to do a baking as a homework. I've been given a tutorial that showed the object and the high definition mesh in the same position and well align, but when I added it the blue and red one is all over the place xompared to the cage. I changed the loew definition's position and dimenssion in its original maya project and exported it again and it does change its relationship with what I see.

I want to know the reason for it, if it is important, how it should look like, what I need to do to make it the right way. Please help