It looks like your main problem is here:

     83 push @data, $line;
     84 
     85 my @sorted =
     86     map  { $_->[0] }
     87     sort { $a->[1] cmp $b->[1] }
     88     map  [ $_, (split)[1] ], @data;  # Sort by Login
     89 
     90 print $SORT "$server\t$date\t$_\n" for @sorted;
     91 }    ##  END of while loop
[download]

For every valid line in the file you are adding it to the @data (and @sorted) array and then adding the complete array to the file. So after the first line you add one line to the file, after the second line you add two more lines to the file, after three lines you add three more lines to the file, after four lines you add four more lines to the file, etc. If your original file contains 100 lines you are writing out 5,050 lines. You need to take the sorting and printing outside of the while loop!

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