Merging files duplicate acks & retransmissions

["Keith French" <keithfrench () btconnect com>]

I have two capture taken on two laptops at either end of a client/server scenario. I want to merge them to use later 
with the new compare feature on Wireshark's Statistics menu. Neither trace has any TCP analysis flags set, other than a 
few window size updates & 1 retransmission.
 
However, when I merge them with Mergecap chronologically, I end up with about 400 TCP window size updates, duplicate 
acks & retransmissions etc.
 
I have tried this on several different trace scenarios and get similar results. Why doe this happen?
 
Keith French.
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