This isn't a Perl question, but I'll address it anyway. :)
In general, HTML forms with the same-named controls will be 'sticky' such that the previous values entered will be populated in a subsequent display of the form.
Usually the way validation errors are handled is to say, "Validation failed for reason X" and re-display the form (often with the label to the offending field bolded), rather than asking the user to press 'Back' (as was noted in Joost's response).
No good deed goes unpunished. -- (attributed to) Oscar Wilde
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