The most failsafe way to always see the new alert is to keep the Lightcatch app closed.
This guide shows how to close the app on an iPhone.
This bug can occur when an iPhone user has the app open and an alert comes. If a push notification comes in there is always a new update on one of the alerts in the app. If the notification doesn't take you to the current update you can go to the map screen and tap each alert. One of those alerts will show a new update after scrolling to see the comments.