branch ahead in commits but push claims all up to date

[Irene Ros <imirene@gmail.com>]

Hi all,

I've been using git for some time now and haven't run into this issue
before, perhaps someone else here has:

I have a branch that is ahead of its origin by a few commits:

$ git status
# On branch myBranch
# Your branch is ahead of 'origin/myBranch' by 10 commits.

Oddly, when I try to do a push, I get a message saying that everything
is up to date:
$ git push origin myBranch
Everything up-to-date

Looking at the log for origin/myBranch I can tell those commits are
missing, but I can't push them up, even with a --force flag. Any
ideas?
Here's the config entry for this branch:

[branch "myBranch"]
    remote = origin
    merge = refs/heads/myBranch

There's also nothing to pull from this branch, I'm the only one working on it.
I use many other branches in this particular repo, and its just this
one that's giving me trouble.

Thanks so much!
-- Irene