There are duplicate entries for names and groups in User browser and Group Browser. This is caused by the
<install directory>WEB-INF/classes/osuser.xml file having the providers defined twice.
Make sure there are no duplicate entries in
WEB-INF/classes/osuser.xml. If the JIRA installation type is WAR/EAR, please re-deploy WAR and restart JIRA. If the solution above does not address problem, try re-indexing JIRA, followed by a restart.
Article ID: JIRAKB267257250