I keep receiving the same couple of messages over and over. I already had a desync error that didn't give me any cards in my hand:
I didn't get a screenshot of the repeating messages, but unless my opponent was totally crazy and really just kept sending the same four or five messages over and over, I think it's a glitch. I believe that my opponent might have experienced the same glitch, as one of the messages that kept repeating was "Who are you talking to?" probably because some of my stuff also kept repeating and was confusing.