problem querying cisco switches

When i run the below code excerpt on some of my switches, sometimes I
end up with tables that are not all the same length

my $vars = new SNMP::VarList(['ifName'],['ifInOctets'],['ifOutOctets'] );
my @resp = $sess->bulkwalk(0, ($numInts + 1), $vars);

for my $vbarr ( @resp ) {
   my $oid = $$vars[$i++]->tag();
   my $num = scalar @$vbarr;
   print "$num responses for oid $oid: \n";
   for my $v (@$vbarr) {
      printf("\t%s = %s (%s)\n", $v->name, $v->val, $v->type);
   }
   print "\n";
}

For example

switch_a:
263 respones for oid ifName
263 respones for oid ifInOctets
262 respones for oid ifOutOctets

switch_b:
265 respones for oid ifName
265 respones for oid ifInOctets
263 respones for oid ifOutOctets

Does anyone know what would make either the Cisco Switch or Perl/SNMP
drop the last or last 2 entries?  The program then kicks out with an
error on undefined references when I try to print out the whole table.

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