The answer
Usually because of bad keys when rendering inputs in a list. Use stable unique keys for every input so React tracks them correctly across re-renders.
Common React Form Mistakes With Controlled and Uncontrolled Inputs
Why do my form inputs lose focus or swap values?
More FAQs in Common React Form Mistakes With Controlled and Uncontrolled Inputs
Because you set value without an onChange handler. Either add onChange to make it controlled, or use defaultValue instead of value to make it uncontrolled. You cannot set value without handling changes.
No. Use a single handler that updates state by field name, so one function handles the whole form. This is far less verbose than a separate handler for every field.
Because you forgot preventDefault on the form's onSubmit handler. Always call preventDefault and handle the submission in JavaScript to keep the single-page experience.
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