Nostalrius Begins - Quality wow vanilla realm (1.12)

I'm not entirely sure how I should put this though, but when ever I am set up in a group. Sometimes I can't even read what my party is trying to say, it just comes up as a blank with no text in it however if they type in one word: yes, lol. or my characters name then I can see it but that is it.

I want to know if this is an issue in game or maybe it's an addon that is causing this.

You are grouping a lot with chinese players then ))