problem using Pages

While typing a document in Pages, the screen keeps automatically jumping to the bottom of the page. I typed for at least an hour and it did not do this. Now it is doing it constantly. What have I done? How do I make it stop?

Rather than tagging on to an old post in the wrong forum, I moved your post here where it belongs as a separate thread.

Also, do not cross post or double post. I deleted your duplicate post you placed in the Notebooks forum.