Posts not saving or showing up on my site

When I go to post a new entry and I’ve written down what I want to say, etc, and then click “Publish” what I wrote disappears BUT it shows up at my site with just the title and nothing else.

I’ve also tried to edit the About page, and it does the exact same thing. I don’t know how to fix it seeing as I’m new to WordPress but any help is appreciated!

Nothing is saving OR showing up anywhere; not on the main page, archives, etc. :\