Hey Scott, So I've been raiding a lot more and I've noticed since updating to version 5.03.01 (Plus) that my personal unit frame does not appear among the other raid frames and they also don't resort when someone leaves the group.
I think Scott replied to another message regarding this. The reasoning I believe is due to you already being on the screen just not in bar format. In 5 man, 10 man you are in the off center and in 25 man and 40 man you are at the bottom of the raid. It is only in 10 man and possibly 15 and 20 that you would notice this anomaly.