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#!/usr/bin/perl -w
use strict;
...
$mech->field( SecQuestion => 'secret answer'); #by name here

$mech->click( {id=>"confirm", synchronize => 0});

You asked for many elements but seem to only want a single item.
Did you forget to pass the 'single' option with a true value?
Pass 'all => 1' to suppress this message and receive the count of item
+s.