[Bro] HTTP and unmatched_HTTP_reply

[Reed Porada]

When running bro (1.3.2), I get several 'unmatched_HTTP_reply'  
statements, and looking at the output in http.log I get several  
'<unknown request>'.  I then printed out the conn_id for these  
requests, then did a random sampling of those within the pcap.  All  
of the sessions looked ok, as in no different then the successfully  
matched request/reply flows.  What might cause these unmatched replies?

Commandline:
bro -r my.pcap  http http-request http-reply http-body

Thanks,
-Reed