ASM - No sample found in requests list

Because the Events table in the ASM mysql database has a limited number of rows, if you have a lot of events, older events can be aggregated with a representative event or deleted out of the database prior to review.

What you are seeing is the result of this.

You need to make a judgement call based on the number of events (low) and the nature of the violation, or review the suggestions on a more regular basis (before the actual events have expired).