I think that the OP might be expecting that keys %grp_advice always return ("grp1","grp2","grp3") in that order because that is how the hash was declared, but it will not. From perldoc -f keys section of perlfunc: 
keys HASH
  Returns a list consisting of all the keys of the named hash. (In
  scalar context, returns the number of keys.) The keys are
  returned in an apparently random order. The actual random order
  is subject to change in future versions of perl, but it is
  guaranteed to be the same order as either the "values" or "each"
  function produces (given that the hash has not been modified).
  As a side effect, it resets HASH's iterator.

In reply to Re: hash unorderly output by davidrw
in thread hash unorderly output by whatluo

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.