The following code
for(my $j = 1; $j<=4; $j++){
unless($j == 1){
}
}
is equivalent to
my $j = 1;
You're looping four times, but doing processing only on the first loop. That's why you don't see the second table you believe you're creating.
I'd also suggest adding use strict; use warnings;.
Revised: to be a little clearer.
Revised (again): A better loop, btw, would be:
for my $j ( 1 .. 4 ) {}
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