Possible bug report

Hi guys, I get strange result when running the following command:

$ git diff develop..HEAD --shortstat --cumulative
 27 files changed, 886 insertions(+), 101 deletions(-)
   9.2% apps/frontend/modules/conversionspecs/actions/
  35.2% apps/frontend/modules/conversionspecs/templates/
  45.0% apps/frontend/modules/conversionspecs/
  45.2% apps/frontend/
   8.7% config/doctrine/
   4.8% lib/filter/doctrine/
   8.1% lib/form/doctrine/
  21.9% lib/migration/doctrine/
  10.0% lib/model/doctrine/
  44.9% lib/
  12.9% apps/frontend/modules/conversionspecs/actions/
  37.1% apps/frontend/modules/conversionspecs/templates/
  50.6% apps/frontend/modules/conversionspecs/
  50.7% apps/frontend/
   6.6% config/doctrine/
   3.2% lib/filter/doctrine/
   9.1% lib/form/doctrine/
  20.6% lib/migration/doctrine/
   8.5% lib/model/doctrine/
  41.5% lib/

As you can see, the --cumulative lines seem to be duplicated, though
the computed stats aren't exactly the same... It appears when you
combine the --cumulative option with either --stat, --numstat or
--shortstat (but not --dirstat) on any local or remote branches EXCEPT
on both master and origin/master.

I use git-flow and git v1.7.9.5 on Ubuntu 12.04 LTS.
Let me know if you need any further informations.
--
Pierre-François CLEMENT
Self-employed web developer
Application developer @ Upcast Social
Phone number (FR): +336.827.331.89
Phone number (UK): +447.449.508.188
http://www.linkedin.com/in/likeyn/en
http://www.doyoubuzz.com/pierre-francois-clement/