Why do list inputs show wrong data in React?
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.
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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.
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.
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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