Why does my React UI show stale data?
Usually a wrong useEffect dependency array or a stale closure. Fix the dependency array with the hooks lint plugin, so the effect re-runs when the relevant values change and uses the latest values.
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More FAQs in Common React UI Bugs and How to Fix Them
Usually a build error, a wrong API URL, or a missing environment variable. Check the console and the Network tab. Often an error boundary is missing, so an unhandled error leaves the user staring at white.
Because you used the array index as the key, so React reuses the wrong elements when the list changes. Use a stable unique id from your data as the key for every list item.
Because you are calling a state setter in the render body or with a wrong dependency array. Move the setter into an event handler or fix the dependency array so the effect does not re-trigger itself.
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