WORKAROUND: Create two separate alarm actions: one for sending email; the other for decrease severity. Make sure the action for sending email is on top of the action for decreasing severity because the order of alarm action decides the execution order.
STATUS: Issue fixed in version 11.5. The latest version of Spotlight on SQL Server Enterprise can be downloaded at https://support.quest.com/spotlight-on-sql-server-enterprise/download-new-releases