Rare catching this one,
When playing on a server with a player with "jj" in front of their username, EG, jjabrahms, when they use the chat in the right pane they show up as "jjabrahms", however, when speaking in the general chat they appear as just "jabrahms"
{F3360}
In this case, jjmelon showcases this on the Shattered Skies server. It could be a resolution issue, but it also occurs occaisonally when a player not with jj in the username types just jj into the chat