Git had a weird little hiccup, and I'm wondering what could have caused it

gistfile1.txt

$ git status
# On branch master
# Your branch is behind 'origin/master' by 19 commits, and can be fast-forwarded.
#
nothing to commit (working directory clean)
$ git pull origin master
[output snipped]
$ git status
# On branch master
# Your branch is ahead of 'origin/master' by 1 commit.
#
nothing to commit (working directory clean)
$ git log origin/master..master
[no output]
$ git status # maybe I'm seeing things?
# On branch master
# Your branch is ahead of 'origin/master' by 1 commit.
#
$ git push origin master
Everything up-to-date
$ git status
# On branch master
nothing to commit (working directory clean)