ResendRequest even the MsgSeqNum is correct when a lot of messages arrived at the same instance

When a lot of messages arrive at the same instance, Quickfix seems to ingore some message (they can be found in the logs),
and think that the earlier message is not arrived, so it will then send "ResendRequest" to the counterparty.

e.g. 34=2, 34=3, 34=4 has arrived at 20091203-08:47:53 [ i use the screenLogFactory]
it will complaint about: (MsgSeqNum too high, expecting 3 but received 4)
and (Sent ResendRequest FROM: 4 TO: 0)

then the MsgSeqNum will be screwed up, keep sending resend request when more messages arrived.
and there will be a messge queue stored the out of order message.
<20091203-08:47:53, FIX.4.2:INITIATOR->ACCEPTOR, event> (Processing queued message: 5, pending: [4, 6, 7, 9, 8, 11, 12, 10, 13, 15, 16, 14, 17, 19, 18, 20, 21, 23, 24, 22, 25, 27, 26])

How to prevent quickfix from ignoring the message with a smaller MsgSeqNum?
Is this a race condition? as mulitple messages arrive at the same instance.