There is a bug when you join an on going instance. I have queued many times for in progress ct and sometimes when I join they are on the fight with the pots. The pots will never EVER do the buff on me that turn me invisible when the team I get assigned to gets the buff. So I definitely think there is a bug for people who join the instance as a replacement for someone who left and it wouldn't surprise me if the display error is another one of them.