Hi Patrick, we are aware of this being an issue for the OSX HipChat client and hope to have a fix for it soon. When this is fixed we will release the updated version through Atlassian marketplace.
I will update this answer when we have released the fixed version.
Edit: A fixed version should be on marketplace now, let us know if you have any more issues! http://help.hipchat.com/ can be a great place to get support if you want help from our support team for HipChat Related issues.
Specifically, 6.11.6 contains a fix. Note, however, that will not fix existing notifications in affected clients. Marketplace listing: https://marketplace.atlassian.com/plugins/com.atlassian.labs.hipchat.confluence-hipchat You can also update directly within Confluence from "Manage add-ons" within the Confluence administration console.
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