Why do "Notifications" fail?

[Emerogork]

I have noticed that if I have not dismissed expired notifications then new ones will not chime to remind me of a time/date in my calendar. The light will not flash anymore to at least notify me of an event visually. No indicator shows at the top and it is not until I open the phone that I see a list of expired notifications.

Is this some kind of silly setting?

It is as if the phone is saying "If this guy is not going to pay attention to me, minute by minute, then I am going to make sure the he misses these appointments."

The phone rings normally and a few notifications actually get through so I know it is not a sound/vibrate setting.

 

[Rukbat]

It could be a "notify once for all notifications" in the app (or "notify for each notification" isn't checked). You get the first one in text, notification tone and vibrate, the rest in text only.