Facebook messenger question - please help

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Blocked Profile - Feb 9, 2017 at 01:11 AM
In my facebook messenger app, when you open it and it has all the people you've received messages from, against one persons name it says I received a message yesterday, however when opening up the conversation thread with that person it shows the last received message as a month ago. The persons conversation is in order as though I received a message yesterday however clearly no message received. Has anyone else experienced this? Could it be a facebook glitch? Would appreciate any suggestions