Hi there,
Thank you for showing interest in our plugin.
Did you upgrade from 0.6 or 0.6.1 to 0.6.2 or from a previous version?
In version 0.6 we changed the database structure to support WordPress multisite hence we had no other option but to purge the alerts. We also issues an alert in the “Upgrading the Plugin” section in the WP Security Audit Log Release Notes.
I am sorry for any inconvenience caused but this only happened this time. Now the database is complete hence further upgrades will not purge any alerts.
While I hope the above answers your query, do not hesitate to get in touch should you have any further queries.