Top 5 Alerts By Name (last 24 Hours) not accurate

[randomnote1]

The chart is showing 116 alerts generated over the last 24 hours for a specific alert. However, using PowerShell to get the alerts of that name over the last 24 hours results in 5,103 alerts.

[randomnote1]

Are these supposed to be open alerts? Or all alerts generated? Either way, it's not looking at the last 24 hours.