It looks like this bug which was recently fixed in the master (dev) branch: http://orgmode.org/cgit.cgi/org-mode.git/commit/?id=21c6148bbe60c278abfb0f035c15c030ac0582c6

If this commit is not merged into the maint branch, you would need to git clone the master branch and build org locally to get it. The version available via package.el is the latest build of only the maint branch. 

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