Earlier in the weekend like Thurs/Fri I could see the user Bossman chatitng. Later in the weekend I couldn't not.
I was talking to another user Pyro. Then it appeared he was having a conversation to himself so I asked who he was talking to and he said Bossman.
So it was apparent I could not see Bossman's messages, nor could he see mine, but Pyro could see both of ours.
Thus I noticed several times where it appeared other users talking to themselves and knew that wasn't the case. I just wasn't seeing all the messages from all the users.
Sorry if this is a known issue, haven't seen it discussed recently.