Your question makes no sense to me, maybe you can simplify it by posting running code that reproduces your problem (as per How do I post a question effectively?), something like

#!/usr/bin/perl --
use strict;
use warnings;
use CGI::Pretty;
my @fudge = 1..3;
my $q = CGI::Pretty->new ( { class => \@fudge } );
print "{$_}\n" for $q->param('class');
print $q->checkbox_group(-name=>'class'), "\n"
__END__
{1}
{2}
{3}
<label>
         <input type="checkbox" name="class" value="1" checked="checke
+d" />1
</label>
<label>
         <input type="checkbox" name="class" value="2" checked="checke
+d" />2
</label>
<label>
         <input type="checkbox" name="class" value="3" checked="checke
+d" />3
</label>
[download]

This what I'm guessing is your issue

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