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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
First, check to make sure you're using the version of SugarCube that you've been using before. (I say this, because the current versions of the Twine editor have a bad habit of "forgetting" story format updates after a few restarts. See this bug and the workaround I suggest there.)
Second, check to make sure you didn't make a change to your CSS which broke all of the CSS after that point. You could use a site like CSS Lint to help check that for you (just copy-and-paste all of your CSS there and click "Lint").