Hello Cindy,
All you have to do is to make your changes in Customized colors and styles (Beta) -> Web pages content section.
Right now, the changes that you have made for (H1, H2, H3) are in both Global settings and Web pages content. So if any setting in Web pages content set to "Automatic" it will be overwritten by the settings from Global settings.
Let me know if this helps.
Denys Zlobin
Helpful Apricot
http://www.wildapricot.com