iOS 10 iMessage Issue - Displaying Same Old Sent Message When Openening From Lock Screen

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Here's what happens:

I get an iMessage from my wife. Pops up on the lock screen, and I'll do a 3D Touch on the message to open it (after being prompted to unlock - I don't allow the messages to show-up without the phone being unlocked)

Once the message is opened in the little small pop-up window, it shows an old message that I sent my wife a couple days before we upgraded from our old phones. Always the same old sent message everytime. However, it DOES show her new message - and it also ALWAYS shows my old message as a text, rather than the iMessage that it was. Also, it shows that she's still typing an iMessage (and she isn't still typing).

I've only had this happen with messages from my wife, for some reason.