2. Underdark-Myconid Necromancer (can't remember his name but wants to take over the colony) died, as well as all of his minions. The icons are permanently attached to the Player Characters portrait and will not go away even after logging out, changing areas, etc. They still remain as part of the party even in inventory.
This happened to me as well.
The Main Character was knocked down / killed. Then resurrected. This added a SECOND Necro Mushroom guy's icon with full HP. So I had two necromancer spore guys, as well as his spawn. All 3 portraits stayed there, even after his spawn died, even after he ended up being killed himself.
Another bug happened when I attacked a crystal. It turned my party against me, so I had to kill the player character and resurrect. Then I went to camp to rest and Astarion (who wasn't in the party) was dead, with Gale next to him standing in a puddle of blood. He couldn't be resurrected by scrolls, nor could I talk to the Skele man and get him to ressurect Astarion. Gale was in my party, I'm not sure how he was standing in blood too, or if he instantly killed Astarion or what.