All notifications cleared when I click on just one.

Is there a way to keep my iPhone from clearing all notifications from the same app when I click on one?

For example:

When I get an X (Twitter) notification, I may receive multiple notifications from the people I follow. Still, when I click on one of the notifications and then go back to read the others, they are all cleared.

I want to be able to go back and read them all. Do I have a setting wrong, or is this how it works? I feel like something changed a few updates ago.

Any help would be appreciated.