From JIRA 6.3.11, JIRA applications automatically "dedupes" branch creation events when processing workflow triggers. If you don't want your JIRA application to automatically remove duplicate branch creation events, you can disable it as described below.

Steps to disable deduping of branch creation events

1. Log in as a user with the JIRA Administrators or JIRA System Administrators global permission.
2. Go to the URL in your browser and enter the following address:
   <baseurl>/secure/admin/SiteDarkFeatures!Default.jspa 
   e.g. http://jira.examplecompany.com/secure/admin/SiteDarkFeatures!Default.jspa
   
3. Enter your password when prompted.
4. In the Enable dark feature field, enter the following:
   jira.plugin.devstatus.branchtrigger.process.duplicates 
5. [登録] をクリックします。

This will disable the deduping of branch creations events only. Note, commit events will still be deduped.

If you want to reenable deduping of branch creation events, click Disable for the jira.plugin.devstatus.branchtrigger.process.duplicates feature on the same page that you disabled it.

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