Chat Realm and sign Bug?

when I play with my friend the chat on the realm seems cannot be seen by both of us. In order to see the chat, I've to relog into the game each time when I realize my friend didn't respond to my chat. We tried using the item 'Sign' to communicate and it also bug out. The word wouldn't appear on the sign when we type it in. I've tried to reset the realm couple of times, it still the same thing happened.