I don't think that this is a bug or anything so I'm going to post this in suggestions:
Life bars in the party HUD only go up to 20, while player screen life bars will go up to... something more than that lol, so basicly even if your character hasn't all it's life bars filled, at the party HUD it might display as if he had. Example: You have 24 life bars filled out of let's say 26 you could have, in you screen it will show you how many there are left to fill, but @party hud it will be as if you had full life bars. that might confuse other players in your party. altough this isn't a major concern update, I still wanted to post this just for the sake of it :)
My suggestion: Pretty simple, make the life bars at party HUD display all our life bars.
Image example: http://img852.imageshack.us/img852/2412/lifebars.png
Yeah, this is a leftover from when health capped at 20.
+1.