A NAS Auto-operator profile has been set up to match only (for example) Critical and Clear alarms and perform some action (like sending an email alert.)
The expectation is that the action will only be taken if the severity of an alarm matches Critical, and then again on a subsequent clear of the same alarm.
Instead, it may seem that profiles are being executed on ALL Clear-severity alarms, regardless of whether the original alarm's severity matched the same profile.
Make sure that, on the advanced tab of the NAS AO Method, you have checked the "Expect the previous severity level to be part of the severity filter" checkbox.
With this option checked, when an alarm with severity level Clear occurs, the previous severity level of the alarm must also be a part of the matching criteria to trigger an action from the profile.