This could be a number of issues. Take a look at the startup logs. It could be a simple permissions issue, or it can be an issue with proxies, name resolutions, etc.
If you're running 7.1 or higher, it can be one of these issues: https://confluence.atlassian.com/jirakb/how-to-fix-gadget-titles-showing-as-__msg_gadget-813697086.html.
...PermissionsStartOnly=true User=www-data Group=www-data ExecStart=/opt/jira/bin/startup.sh ExecStop=/opt/jira/bin/shutdown.sh TimeoutStartSec=120 TimeoutStopSec=600 PrivateTmp=true [Install] WantedBy...
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