[htdig] duplicate results 3.2.0b4-20021110

[Budd, S. <s....@im...>]

using htdig 3.2.0b4-20021110 on Solaris 8

Dig with the following  bits of config file:
............................
minimum_word_length:    2
external_protocols:     https
/home/ppp/htdig-test-3.2.0b4.1110.play/bin/handler.pl  
allow_in_form:          search_algorithm 
allow_numbers:          true
database_dir:		/3.2.0b4/1110/helpdesk
conf:
/home/ppp//htdig-test-3.2.0b4.1110/special-runs/helpdesk-dig
max_hop_count:               14
check_unique_md5:       true

external_parsers:      application/pdf->text/html /usr/local/bin/doc2html.pl
\
                       application/msword->/text/html
/usr/local/bin/doc2html.pl 

#  the following configuration variable will prevent any unaccessed url's
from being deleted.
#remove_bad_urls:             false
remove_bad_urls:             true
..................................
The md5 sums appear in the  vvv listing ok.
The results of a search may  have  two , sometime three, entries with
identical  url and extract.

Can you indicate what is wrong?