Your Cornerstone is not updated, you can easily update cornerstone, by deactivating and deleting your current Cornerstone.
Then navigate to X > Validation wait for a few seconds and X will automatically re-install the latest version of Cornerstone (3.3.1) for you.
Remember to clear all your caching features (plugin, server-side, CDN, and browser's cache) after updating so that the code from the latest release is always in use. This will help you to avoid any potential errors.
Hope it helps,