It's probably a bug (and certainly not desirable). I've reported it. The only workaround I can find at the moment is to use "\xa0" (a single non-breaking space) where no data is available. Like so: 
#! /usr/bin/perl -w
use strict;
use 5.010;

use Perl6::Form;

my @last = qw(Smith Jones Wright Wong Evans McFee Ho Nuygen Willians H
+owlett Jones Peters Milford Tam Lam Soma Egon Wilson);
my @first = qw(Jim Jack Wendy Lee Bo Lenord Jan Dana Lindy Kyle Nora J
+ane Bill Woo John Mick Lazlo Jenna);
my @mid   = ("\xa0", "\xa0", 'A', "\xa0", "B", "\xa0", "\xa0", 'A', "\
+xa0", "B", "\xa0", "\xa0", 'A', "\xa0", "B", "\xa0", "\xa0", 'A');
my @suf   = ("") x 18;
my @nick = qw(Jim Jack Wendy Lee Bo Lenord Jan Dana Lindy Kyle Nora Ja
+ne Bill Woo John Mick Lazlo Jenna);
my @ID = 1..18;

print form
    { 
      page => { length => 15,
                number => 1,
                feed => "\f",
                footer =>            "________________________________
+_____________________________________\n",
                header => { first => "================================
+=====================================\n"
                                   . "|                   xxxxxxxxxxxx
+xxxxxxxxxxxxxxxx                    |\n"
                                   . "|                     xxxxxxxxxx
+xxxxxxxxxxxx                        |\n"
                                   . "|                               
+                                    |\n"
                                   . "|                          List 
+of Players                          |\n"
                                   . "|===============================
+====================================|\n"
                                   . "|Last                |First     
+          |MI|Suffix|Nickname  |  ID|\n"
                                   . "|_______________________________
+____________________________________|",
                          other =>   "================================
+=====================================\n"
                                   . "|                          List 
+of Players                          |\n"
                                   . "|===============================
+====================================|\n"
                                   . "|Last                |First     
+          |MI|Suffix|Nickname  |  ID|\n"
                                   . "|-------------------------------
+------------------------------------|",
                     }
            }
    },
    "| {]]]]]]]]]]]]]]]]} | {]]]]]]]]]]]]]]]]} |{}| {II} | {]]]]]]} | 
+{} |\n",
        \@last,              \@first,          \@mid,\@suf, \@nick,  \
+@ID;

[download]

In reply to Re^3: Headings in Perl6::Form by Anonymous Monk
in thread Headings in Perl6::Form by BigJerry

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.