Hi Reid
No problem. A quick reminder that all WordPress themes completely overwrite their own folders during updates. It’s best to use a plugin like Simple Custom CSS for your CSS snippets.
For the home page title the easiest is to go to Pages > Home and edit the home page, in the right column set the page template to Full Width – No Page Title or Page Builder Home as you have done.
The problem is that a large portion of the theme’s style.css file is missing. If you haven’t made many modifications then I’d suggest replacing it with the original contents which you can find here: https://purothemes.com/wp-content/uploads/2016/05/style.css