Issue: When you click Select All in alerts views to select alerts, deselect few alerts, and modify them, new incoming alerts are also selected in the refreshed alert views. This results in wrong count of alerts selected for modification, and also it appears as if you are modifying new incoming alerts too. However, only the originally selected alerts are modified.
Workaround: No new alerts will appear in the alert view if you create the alert view with a custom time range.