I am not able to reproduce your results. When I run your script it outputs in the correct order. When I change the case of the names the output changes as expected.

my %meta = (
"Author"=>"J K Rolling",
"title","Harry Potter and the Philosopher's Stone"
);
Sorts: Author, title

<meta content="J K Rolling" name="Author" />
<meta content="Harry Potter and the Philosopher's Stone" name="title" 
+/>


my %meta = (
"author"=>"J K Rolling",
"Title","Harry Potter and the Philosopher's Stone"
);
Sorts: Title, author

<meta content="Harry Potter and the Philosopher's Stone" name="Title" 
+/>
<meta content="J K Rolling" name="author" />
[download]

If I use an Array of Arrays to ensure the correct order I also get expected results:

my @meta = (
["Author"=>"J K Rolling"],
["title","Harry Potter and the Philosopher's Stone"]
);
Sorts: Author, title

<meta content="J K Rolling" name="Author" />
<meta content="Harry Potter and the Philosopher's Stone" name="title" 
+/>


my @meta = (
["author"=>"J K Rolling"],
["Title","Harry Potter and the Philosopher's Stone"]
);
Sorts: author, Title

<meta content="J K Rolling" name="author" />
<meta content="Harry Potter and the Philosopher's Stone" name="Title" 
+/>
[download]

The docs state that push_content "adds the specified items to the end of the content list of the element". Nothing about sorting, and in your case the element is the head. There is also an unshift_content.

I used this loop for the AoA:

for my $m ( @meta ) {
  my $m_el = HTML::Element->new('meta');
     $m_el->attr('name',$m->[0]);
     $m_el->attr('content',$m->[1]);
     $head->push_content($m_el);
}
[download]

---

---

• Are you posting in the right place? Check out Where do I post X? to know for sure.
• Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:

  <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>

• Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
• Want more info? How to link or How to display code and escape characters are good places to start.