You might try replacing push( @all_rows, $ref ); with push( @all_rows, [ @$ref ] );.
The DBI docs for fetchrow_arrayref() say "Note that the same array reference is returned for each fetch, so don't store the reference and then use it after a later fetch.".
The [ @$ref ] effectively does a shallow clone of $ref, so you should get distinct values again. Of course, if it were me I would push $ref->, and then in the following foreach loop just print "$row_ref\n";.
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