Rich Text Page formatting doesn't work

Using a Rich Text page I'm creating an app user guide. I'm using the tool bar to select font, font size, bold/italic - you know, the usual stuff. No problem. It looks good when I'm in the page editing it.

When I save the page and then go to it via the link on my Home page, the page loads and a lot of those format changes I made don't appear. The font is clearly not Verdana (looks more like Times Roman), the section headings are not 18pt font...

I don't know why the page I'm looking at when I edit it - and that I save - looks nothing like the page when it's actually viewed by the user. What's going on?