The Apex One SaaS product development team might have released a hotfix, which may include an update for the scan engines. In this case, the Apex One SaaS scan engine version will differ from the Apex Central scan engine version when displayed on their respective management consoles, and this behavior is normal.

To verify this, you may go to the Apex One™ as a Service monthly maintenance schedule. Also, you may click the bell icon on the upper-right corner of your Apex Central web console to check your maintenance schedule.