See attached screenshot

In the parent job "Django-Deploy-Prod" I have:

1. post-build actions to "Trigger parameterized build on other projects" for each of the four immediate downstream jobs
2. a Join Trigger to run the "Django-Merge-Release-Branch" job after those four have completed

When I look in the UI I see not one but four copies of the job triggered by the Join Trigger.

This is not what I expected and seems like a bug.

 
I have:

• Join plugin 1.21
• Parameterized Trigger plugin 2.35.2
• Jenkins 2.10