After editing the post and updating, sometimes the post does not go to the top of the homepage. The post is saved but in the Post editor it is not in order and therefore the newest post is well down the stack.
Example: viewing post 99, newest post 100 is saved but ATA places it in position 90.
I would rather not do a Sticky and I am going to create a static page soon.
Thanks.

I discovered what the issue was. The "publish date" of the newer post was older than the older post and the posts are published by newest date.

posts are displayed by wordpress in date created order, not date modified. If you want to change the order of where a post shows, you have to change the date created. You might look for a plugin...