Someone

sub routine {
    ...code...
    ...code...
    print "MY CHOICE #1: $my_choice\n";
    read_export_file(@config_values, $my_choice);
}

sub read_export_file {
    my @config_values = shift(@_); 
    my $config_choice = shift(@_);
    print "MY CHOICE #2: $config_choice\n";
}

MY CHOICE #1 gives one(1) , that's good, but in the second function:
MY CHOICE #2 gives two(2), why is that?