'git commit' duplicates parents?

I just checked in a change with 'git commit' (no arguments).  Two 
strange things occurred:

1) git-whatchanged does not list the change at all.  However,
	a) I verified that my change is indeed top-of-tree
	b) git-changes-script (attached) does show the change

2) git-changes-script shows the parents in a readable fashion, and it 
shows two duplicate parent entries.  In contrast, other changes do not 
have two parents:

my change:

commit 4864989199fa62c7044be2258550ddc561411ab6

		^^^ top of tree aka .git/HEAD

tree b40996c7a0a5446875aa3664045af7e377451bf6
parent 7df551254add79a445d2e47e8f849cef8fee6e38
parent 7df551254add79a445d2e47e8f849cef8fee6e38
author Jeff Garzik [off-list ref] Sun, 19 Jun 2005 20:06:28 -0400
committer Jeff Garzik [off-list ref] Sun, 19 Jun 2005 20:06:28 -0400

fc4/fc:  fix warnings/errors caused by recent changes

a random change not committed by 'git commit':

commit 7df551254add79a445d2e47e8f849cef8fee6e38
tree 468a43ac3f94b9bf8618b102a7d609e29d3900f5
parent f7d7fc0322c1770fe7ee836ca2732c2f88e2e1a4
author David S. Miller [off-list ref] Sun, 19 Jun 2005 13:01:10 -0700
committer David S. Miller [off-list ref] Sun, 19 Jun 2005 13:01:10 -0700

[TCP]: Fix sysctl_tcp_low_latency

When enabled, this should disable UCOPY prequeue'ing altogether,
but it does not due to a missing test.

Signed-off-by: David S. Miller <davem@davemloft.net>