Why am I on Master instead of my branch

From: Jeffrey Walton <noloader@gmail.com>
Date: Mar 15, 2020, 01:54 UTC
Message-ID: <CAH8yC8=FZrDmHBSk=GFZd08Ovk4zffyB7KEOoyUpAPLYi_xUeA@mail.gmail.com>

I'm trying to test some changes I made on a branch on some other machines. The changes were committed and pushed. However, after a checkout and pull on the other machines the changes were missing.

When I do a 'git branch' I am on master for some reason:

$ git branch
  cmake-inno-setup-COVERAGE
  config-guess
  declarations
* master

However, I have never switched back to master:

$ history | grep git | grep -E 'master|cmake'
...
2630  git checkout cmake-inno-setup-COVERAGE
 2631  git fetch upstream cmake-inno-setup-COVERAGE
 2632  git checkout cmake-inno-setup-COVERAGE
 2634  git checkout cmake-inno-setup-COVERAGE
 2635  git branch cmake-inno-setup-COVERAGE
 2757  git diff upstream/master
 2766  history | grep git | grep -E 'master|cmake'
<end of history>

How am I on master when I checked out cmake-inno-setup-COVERAGE?