nLivesRemaining should be in your hud.
The way it looks, you have 5 actors, each have nLivesRemaining at 10.
When an actor collides, 1 is subtracted from it’s own lives of 10, passes 9 to the hud, and then is destroyed.
When another actor collides, 1 is subtracted from it’s own lives of 10, passes 9 to the hud, and then is destroyed.
Put the lives variable in 1 place (perhaps the hud) so there’s only 1 version of it.