This is due to the following reasons:
On a few occasions when I have entered my post write up into the post form, and then click the post button. A number of things have happened.
On one occasion, I got an error message and the post was not submitted. Another time, the post submission just timed-out and was not submitted. While on another occasion, when the post button was clicked, I was sent back to the home page. So to stop me from having to enter all the information again, especially when I have entered a few HTML coding and have taken the time to style my post. I now just copy everything and save it in my free text editor program. This is also a great way to back up all the posts you submit to the site on your computer.I hope someone finds this tip useful.