This is happening to me and has been for a while. I found a whole bunch of reddit posts saying the same thing. At first I thought my messages weren't being received right away but I've found that every conversation with my wife (and many others) has two timestamps, exactly an hour off, while my messages only have one (which correspond with the 2nd message - received, not sent - in the message stream as we have back and forth conversations).
This is happening to me and has been for a while. I found a whole bunch of reddit posts saying the same thing. At first I thought my messages weren't being received right away but I've found that every conversation with my wife (and many others) has two timestamps, exactly an hour off, while my messages only have one (which correspond with the 2nd message - received, not sent - in the message stream as we have back and forth conversations).