Issue
I have created a new Pipeline job that was previously deleted on a controller using CloudBees High Availability (active/active), and the counter is not starting with the number 1.
Resolution
When you have a Pipeline that already ran at least one build, and you delete the Pipeline, the expected behavior is that if you create another Pipeline with the very same name, the build counter will reset. If you have CloudBees High Availability (active/active) enabled on an affected version, and you create a new Pipeline with the same name as a previously deleted Pipeline, the build counter will reuse the same number as the deleted Pipeline.
This issue will be fixed in a future CloudBees CI release, and this article will be updated with the specific version number with the fix.
Workaround
Restarting your controller will reset those counters for the previously deleted Pipeline.