Argus flow direction

Greetings to the list...

I'm trying to understand why I'm seeing a second flow with an ambiguous
direction for this traffic. Given the saddr, sport, daddr, dport, proto are
all the same and the start/last times fit within the first line, I would
have thought it would have been considered part of that connection.

racluster -m saddr sport daddr dport -r argus-eth0.20170307*.gz -s stime
ltime proto saddr sport dir daddr dport pkts bytes dur - ipv4 and proto 6
and  net 1.2.3.0/24

               StartTime                 LastTime                 Proto
SrcAddr  Sport   Dir        DstAddr  Dport  TotPkts   TotBytes     Dur
17-03-07 16:04:56.830048 17-03-07 16:31:07.160901      6
2.3.4.5.64453     ->         1.2.3.32.7610         10       1799  1570.3308*
17-03-07 16:26:39.835133 17-03-07 16:26:39.835244      6
1.2.3.32.7610     <?>       2.3.4.5.64453         2        120     0.000111

Any insight would be appreciated!

Thanks!

tbh