My first suggestion is to use a different browser, this will allow us to confirm if the behaviour is browser or application specific.
The next check would be the JIRA Agile plugin. You will be able to access the plugin from: https://<your_instance>/plugins/servlet/upm#manage
Search on 'JIRA Agile' and confirm 216 modules are enabled. You can perform 'Disable' then 'Enable' to reinitialise the plugin on your instance.
I've found the ticket, however I will need you to raise the ticket in support.atlassian.com, this allows me to confirm the OnDemand instance that has been affected.
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