[netflow-tools] Weird duplicate netflow records

[Franz Böhm]

Please have a look at the following netflow records. Sometimes I get 
double records like the samples below.
They were generated with pfflowd, collected with nfcapd and viewed with 
nfdump.

2009-01-04 11:00:26.556  5167.000 TCP          10.0.3.34:4147  ->    
80.140.195.57:30730     8118    9.4 M     1
2009-01-04 11:00:26.556  5167.000 TCP      80.140.195.57:30730 ->        
10.0.3.34:4147      4583   188560     1
2009-01-04 11:00:25.990  5178.000 TCP          10.0.3.34:4147  ->    
80.140.195.57:30730     8118    9.4 M     1
2009-01-04 11:00:25.990  5178.000 TCP      80.140.195.57:30730 ->        
10.0.3.34:4147      4583   188560     1

2009-01-04 14:25:26.720   800.000 TCP          10.0.3.50:1942  ->    
87.248.217.89:80       19858   802352     1
2009-01-04 14:25:26.720   800.000 TCP      87.248.217.89:80    ->        
10.0.3.50:1942     38147   53.9 M     1
2009-01-04 14:25:25.720   801.000 TCP          10.0.3.50:1942  ->    
87.248.217.89:80       19858   802352     1
2009-01-04 14:25:25.720   801.000 TCP      87.248.217.89:80    ->        
10.0.3.50:1942     38147   53.9 M     1

I would be very thankful if someone has a hint for me.