typing problem....

whenever im making a review and i am like halfway into it and i have scrolled down a certain point whenver i type it will pop back up to the top or somthing andwhen i type again it shows for a split second that i am typing where i want to but then it shows the top again…

Huh?

Maybe if you’re doing something long like that you should use a text editor to type your stuff, then cut and paste into a post.