Facebook Messenger: Messages received but never read

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May 5, 2017, 8:51:58 PM via Website

I've sent two messages on Messenger last night with two minutes in between to two friends. The messages have been delivered but now 20 hours later they haven't been marked as read and none of them have replied though it was a message that I certainly would expect a reply from (since both of them often read it within a few hours). I don't believe they wouldn't have read it after 20 hours, so I'm expecting some Messenger issues. Have any of you tried something similar? What could the problem be?