When you are creating the page, it will not alway look exactly like it does in the Content Editor.
You will have to tweek it to give it, by making a change, saving it, and then clicking on the View link.
Below shows you an example of how what one of my pages looks like in the Content Editor compared to the way it appears on the website page.
The arrows show you how differently the text lines up in the Content Management box to the Website Page.