I recently installed GitLab and am attempting to use GitLab CI. I successfully enabled GitLab CI in my GitLab Server and successfully installed a CI Runner (on Windows, if this is relevant). I enabled a project for the Windows CI Runner and when I commit to the repository the runner is executed and I can see the builds.

I installed a second CI Runner (on Debian) following the documentation. I can see the Debian CI Runner is registered, along with the Windows CI Runner. The Debian CI Runner has the same project assigned to it. However, when I commit to the repository only the Windows CI Runner is executed, the Debian CI Runner is not attempting to build.

What mistake have I made or what additional configuration is there to enable this? I have already tried re-registering the Debian CI Runner with no success.

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**Update 1:** The Debian CI Runner is now executing but the Windows CI Runner is not. It seems to select only a single runner.

**Update 2:** Upgraded to 'GitLab CI 7.14.1 2dee1b3' but same behaviour persists.

**Update 3:** Added a third runner on a Scientific Linux machine. It is registered and assigned the project but only a single runner executes (currently the Debian CI Runner).

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GitLab CI 7.12.0 e96755c