Hemingway Rewritten issues

I’m having problems today viewing my wordpress site, with the Hemingway Rewritten theme. All the formatting has disappeared, and it’s just showing up as plain text. I’m using Chrome as my web browser, but have also tried IE with the same result, and Safari on a Mac with the same result. I’ve also noticed some other pages also using this theme aren’t loading on my computer properly either. Is this a problem with my page, or with all pages using this theme? I’m completely new to writing a blog, and terrible with all coding/programming scenarios.
Any advice gratefully received!