This is the default font size.
This makes it difficult to differentiate between headers, subheaders, etc. They're all pretty much the same size.
Edit: they show up fine in forums, but I'm not seeing a difference in wiki pages, i.e. Chrono Trigger.
edit 2: Nevermind! They weren't showing up for me last night, but they look fine now. Disregard this! Would be nice if the WYSIWYG editor displayed actual sizes.