git-describe doesn't show the most recent tag

["Erez Zilber" <erezzi.list-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

Hi,

I'm trying to run git-describe on the open-iscsi git tree
(git://git.kernel.org/pub/scm/linux/kernel/git/mnc/open-iscsi.git):

[erez.zilber@erez-lx:/tmp/open-iscsi.git]$ git-branch -a
* master
  origin/2.0-869-bugfix
  origin/HEAD
  origin/bnx2i
  origin/cxgb3i
  origin/master
[erez.zilber@erez-lx:/tmp/open-iscsi.git]$ git-describe
2.0-868-rc1-81-g31c9d42

However, there are newer tags than 2.0-868-rc1:
[erez.zilber@erez-lx:/tmp/open-iscsi.git]$ git-tag
2.0-868-rc1
2.0-869
2.0-869-rc2
2.0-869-rc3
2.0-869-rc4
2.0-869.1
2.0-869.2
2.0-870-rc1

>From what I see in the man page "git-describe - Show the most recent
tag that is reachable from a commit". In this repository, it doesn't
look like that...

Now, I switch to the "2.0-869-bugfix" branch:
[erez.zilber@erez-lx:/tmp/open-iscsi.git]$ git-checkout -b
2.0-869-bugfix origin/2.0-869-bugfix
Branch 2.0-869-bugfix set up to track remote branch
refs/remotes/origin/2.0-869-bugfix.
Switched to a new branch "2.0-869-bugfix"

and running again git-describe:
[erez.zilber@erez-lx:/tmp/open-iscsi.git]$ git-describe
2.0-868-rc1-33-g81133dd

Only if I use the --tags flag, I get what I expected:
[erez.zilber@erez-lx:/tmp/open-iscsi.git]$ git-describe --tags
2.0-869.2

Why is this happening?

Thanks,
Erez