I think you'll find the problem is you're pushing a reference to %rec to your @DA each time, but you only have one instance of %rec, i.e. all your references point to the same thing.

So if you move the definition of %rec inside the loop it should do what you want.

So something like this

for (@buckets) {
    my %rec;
    ...
    push @DA,\%rec;
}
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