You're adding stuff to the hash whose keys you are iterating over (%rpt_tbl) -- this is considered bad form. This hash has extra stuff (in terms of the HTML::Template vars) that the template doesn't like.

I think what you really mean to do is this (or the equivalent map):

for my $key (sort keys %rpt_tbl) {
  push @radio_loop,
       { rpt_no => $key, rpt_descr => $rpt_tbl{$key} };
}
[download]

The way you had it, since you kept pushing a reference to the same hash onto @radio_loop, all the rpt_descr's and rpt_no's would have come out the same anyway.

In the future, you can also avoid "this parameter name doesn't match any declarations in the template file" errors by setting die_on_bad_params to zero in the template declaration.