Bug report: git log --[num|short]stat sometimes counts lines wrong

Hi there. This is my first contribution to git (if you count a bug report as a contribution) and I'm not really familiar where to report bugs. In the irc channel #git at freenode somebody pointed me to this mailing list.

First of: I'm running git version 1.7.6 on OS X 10.6.8.

Let me describe what I observed. repository: https://github.com/voldemort/voldemort.git The command "git log --numstat c21ad764ea1bae7f7bd83b5e2cb015dcbc44d586" shows for the commit c21ad764 and file '.../readonly/mr/HadoopStoreBuilderReducer.java' 25 lines added and 22 lines removed. But the patch of HadoopStoreBuilderReducer.java that I get with "git show c21ad764ea1bae7f7bd83b5e2cb015dcbc44d586 -- contrib/hadoop-store-builder/src/java/voldemort/store/readonly/mr/HadoopStoreBuilderReducer.java" adds 30 lines and removes 27.

Why does "git log --numstat" drops 5 added lines and 5 removed lines? This also holds true for "git log --stat" and "git log --shortstat".

Is this a bug or am I missing an option to git log or git show?

More commits where I observed this problem on the same repository: 7e00fb6d2cf131dfed59c180f2171952808cc336 src/java/voldemort/client/rebalance/MigratePartitions.java 78ad6f2a6ea327dbae2110f4530a5bd07e5deaac src/java/voldemort/client/rebalance/MigratePartitions.java (same commit on another branch) 7871933f0f0f056e2eeac03a01db1e9cf81f8bda src/java/voldemort/client/protocol/admin/AdminClient.java 2d6f68b09c3bdc23dcf3ae1f91c9285fbd668820 src/java/voldemort/store/readonly/ExternalSorter.java 6fcacee866307ec34eb32b268e2c2b885a949319 build.xml

Greetings from Berlin Alex