Why does camera jump up and down by a floor on some houses not others?

This happens to me all the time.. I think it has something to do with large trees within the lot or even if there is a large hill or tree in the world close to the lot I'm building or playing in. The camera with jump up and down from the height of whatever is around instead of staying level with the floor I'm playing or building on. This is my first comment so I hope I'm in the right place and doing it right?