I have been having this problem on the last 2 posts. I set a HEADER 2, and the font remains small. In this case it says 18pt but looks more like 12pt. The font in the Header 2 is the same size as the rest of the post. I click on the section, click T for TEXT, increase the size. The Text Editor says it is 33pt, and I increase it to 54pt, the actual FONT remains the same, but the box increases in size. I save/publish and on the site, the Header looks the same size as the rest of the post. I also can’t change font color any longer. That is the other editing tool that seems to have gone to the wayside.
The only plug in I have added is WP Header images, that I don’t think I need. Could that be the issue?