I'm having this problem, whereas I set the menu and the body text in Text Formats and then it looks totally different between the preview and the actual web page. Somehow the type looks way thicker and not as sharp.
This is from the preview panel
and this is from the actual webpage
raydao.com pass: blahblahblah
If anyone having the same problem at some point and be able to fixed it, please let me know as well, thank you!