We'd need to see the code where you create your hash to know what your problem is. This seems to work as I would expect: 
#!/usr/bin/perl -w

use strict;
use Data::Dumper;

my %data = ( A => { one => 1,
                    two => 2,
                    three => 3 },
             B => { four => 4,
                    five => 5,
                    six => 6 },
             C => { seven => 7,
                    eight => 8,
                    nine => 9 } );

print Dumper(\%data);

[download]
The output is: 
$VAR1 = {
          'A' => {
                   'three' => 3,
                   'one' => 1,
                   'two' => 2
                 },
          'C' => {
                   'nine' => 9,
                   'eight' => 8,
                   'seven' => 7
                 },
          'B' => {
                   'six' => 6,
                   'five' => 5,
                   'four' => 4
                 }
        };

[download]

In reply to Re: Data::Dumper and Hash of Hashes by davorg
in thread Data::Dumper and Hash of Hashes by James

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.