Notifications messed up – Messenger Review

The last update messed my my notifications so that it always dings when I get a new message like I want, but then it might only show the first of a series of messages as a notification (or) none of them (or) it pops up for a sec then disappears. Please fix this issue. At this point I have to remember to check the app by hand, which defeats the purpose of notifications.
Review by Eidetically on Messenger.