Our theme does not influence this functionality. You can check the issue on some default theme. The reason is that, for example, blog page, shop page and projects pages are not closed. This feature works for a single page and post however if a page is a functional page, it is not closed.
I’ve encountered an issue with Slider Revolution plugin which won’t properly show fonts. I’ve customized a slider in page “Home” with two different google fonts. One is displayed correctly, the other one is replaced with something else.
I’ll attach screenshots.
As you can see the font is properly displayed in the editor but not in the page itself.