my $warranty_dates  = $self->every_param('warranty_date');
  my $state_ids       = $self->every_param('state_id');

results in:

$VAR1 = undef;
 and

$VAR1 = '12/12/2017';
$VAR2 = '12/12/2017';
$VAR3 = '12/12/2017';
$VAR4 = '12/12/2017';
$VAR5 = '12/12/2017';

respectively when called by
#  die Dumper(@{$state_ids});

  die Dumper(@{$warranty_dates});

when the application dies

despite being shown as having the following parameters:

  "state_id" => [
    1,
    1,
    1,
    1,
    1
  ],
  "warranty_date" => [
    "12/12/2017",
    "12/12/2017",
    "12/12/2017",
    "12/12/2017",
    "12/12/2017"