my (@date, @F_SCORE, @F_SCORE_BOX,
This assignment makes @date gobble up all the values on the RHS, leaving the other arrays empty. A smaller example will illustrate this: 
use warnings;
use strict;
use Data::Dumper;

my ($date_ref)    = [0..3];
my ($F_SCORE_ref) = [5..7];
my (@date, @F_SCORE) =  (@$date_ref, @$F_SCORE_ref);
print Dumper(\@date);
print Dumper(\@F_SCORE);

__END__

$VAR1 = [
          0,
          1,
          2,
          3,
          5,
          6,
          7
        ];
$VAR1 = [];

[download]

From perldata:

You can actually put an array or hash anywhere in the list, but the first one in the list will soak up all the values, and anything after it will become undefined.
You should consider a different data structure: perldsc

In reply to Re: Referencing/returning array of hashes from sub by toolic
in thread Referencing/returning array of hashes from sub by PoGGiE

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.