I also experienced the same problem recently--or maybe I only noticed it recently.  For me it wasn't the last record, but the first record as Zaxo suggested above.  To solve the problem I switched from a while loop to a foreach.  Below is my related code excerpt.  In this case I'm generating a hash from records from a mySQL database.  I'm also using fetchall_hashref instead of fetchrow_array.

my $sql_stmnt = "SELECT rec_id, name FROM writers";
my $dbh = DBI->connect("DBI:mysql:db:localhost","user","passwd")
   || die "Could not connect to database: " . DBI->errstr;
my $sth = $dbh->prepare($sql_stmnt);
$sth->execute();
my $results = $sth->fetchall_arrayref();
my %results;
foreach my $row(@$results) {
   my ($key,$value) = @$row;
   $results{$key} = "$value";  
}
$sth->finish();
$dbh->disconnect();
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-Spenser

That's Spenser, with an "s" like the detective.