Is it possible that you accidentally went back in your history?
The History panelwill show every change you've made in your project, unless you clear the history. Also, the top part of the panel shows saved "versions" or states of your project that you can go back to. You can create these by hitting "Cmd/Ctrl + S" or by clicking the "Save New Version" button at the bottom of the History panel.
If that top section with the different versions is empty, there's still another place to try. Click the flyout (hamburger) menu of the History panel and click "Show Auto-saved Versions." This will switch from your manually saved versions to ones Character Animator made by itself. Hopefully something here will get you back to where you need to be.
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